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The Military Wallet

Space-A Travel Guide: Everything You Need to Know to Take a Flight on a Military Hop

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What Are Space-A Flights (AKA, Military Hops)?

Are you eligible for a space-a flight, how does space-a travel work.

1. Identify Your Destination and Possible Routes

2. Follow the Space-A Flight Schedules of the Passenger Terminals You May Use

3. sign up to travel from all possible starting locations, 4. mark yourself present within 24 hours of roll call, 5. listen for your name during roll call, 6. check your luggage and obtain your boarding pass, 7. board the aircraft and pick your seat, what to expect on a space-a flight, pros and cons of flying space-a, the pros: what are the advantages of flying space-a, the cons: what are the disadvantages of space-a, when should you use space-a, what would a seasoned space-a traveler recommend.

Update: On April 22, 2022, the Office of the Under Secretary of Defense lifted all restrictions on Space-A travel. These restrictions were put in place in March 2020 to limit the spread of Covid-19. Mask mandates and medical screening protocols may still apply.

Looking for a way to save money on travel ? Flying space-available (Space-A) on a military flight can be a fun and inexpensive way to see the world, as airfare to and from U.S. military bases can cost you next to nothing.

Flying Space-A on military aircraft is very different from using commercial air travel, and you can’t just call a military passenger terminal and book your flight. It’s worth learning how Space-A travel works so you can take advantage of this incredible privilege available to eligible members of the military community.

After military flights accommodate all required passengers and cargo, they often release extra seats to service members, retirees and their families. These eligible passengers can “hop” on the flights on a space-available (Space-A) basis. This is where the term “military hop” comes from.

Because these are military, not commercial, flights, the military mission is always the priority. You may fly on a commercial plane, but you could also be in a cargo plane or fuel tanker.

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There are six categories, or “cats,” of eligible Space-A travelers, depending on their duty status and the reason they are traveling.

Those in lower-numbered categories receive higher priority for available seats.

Here is a summary of the Space-A travel categories, according to the Military OneSource website :

Cat 1: Emergency leave unfunded travel

Cat 2: Accompanied environmental and morale leave (EML)

Cat 3: Ordinary leave, service members’ relatives, house-hunting permissive temporary duty (TDY), Medal of Honor holders , and foreign military; also includes unaccompanied dependents of service members deployed for more than 365 consecutive days.

Cat 4: Unaccompanied EML; also includes dependents of service members deployed between 30 and 364 consecutive days

Cat 5: Permissive TDY (non-house-hunting), student travel, and post-deployment/mobilization respite absence; also includes unaccompanied dependents of service members stationed outside the continental U.S. (OCONUS)

Cat 6: Military retirees, their dependents, military reserve, Reserve Officers’ Training Corps (ROTC) members and veterans who are 100% disabled

It is important to know your category when planning your Space-A travel because your category determines when you can sign up, what paperwork you need, and where you are eligible to fly. Table 3 in Section 4.11 of Department of Defense Instruction 4515.13 has more details on eligibility by category and approved geographical travel segments.

Eligibility Note for Veterans with a 100% Disability Rating :

According to the AF.mil website , “veterans with a service-connected, permanent disability rating of 100 percent will be able to travel in the Continental United States or directly between the CONUS and Alaska, Hawaii, Puerto Rico, the U.S. Virgin Islands, Guam, and American Samoa (Guam and American Samoa travelers may transit Hawaii or Alaska); or traveling within Alaska, Hawaii, Puerto Rico, or the U.S. Virgin Islands on flights operated by Air Mobility Command.”

Disabled veterans must have a DD Form 2765, Defense Department ID Card (Tan), to fly Space-A.

The better you understand how to fly Space-A, the greater your chances of having a successful trip.

The first step is to learn which bases have regular flights to where you want to travel. This list of worldwide destinations where Space-A travel may be available includes profiles of some of the terminals and information about typical flight destinations. You’ll want to begin following some of their Space-A flight schedules, which we’ll discuss in the next step.

You may find several possible routes to your desired destination. For example, if you are on the East Coast and want to fly to one of the common destinations, including Spain or Germany, you will likely be able to travel from several nearby bases. Travelers from other parts of the U.S. may need to take two or more hops to get there.

The Space-A Travelers Facebook group can help you put together a flight plan to your destination. You can ask questions and find information about flying to and from specific locations.

You may have to combine Space-A travel with other transportation. For example, you may need to fly or drive to a base with regular Space-A flights to your desired destination. Or you may need to take a train or flight from an overseas base to your final destination.

The Air Mobility Command website maintains a list of all the military passenger terminals , as well as their contact info and links to their websites and Facebook pages.

You’ll find a 72-hour flight schedule for most terminals on their Facebook pages or the AMC website. The schedules include trip destinations, the number of Space-A seats and the “roll call” time. The roll call time is when terminal staff announces who has been selected for the flight.

You may also find information about recently departed flights, including how the number of Space-A seats and how many passengers competed for those seats.

Click here for more details on how to read the Space-A schedules on Facebook .

When you monitor the flights that depart from your target passenger over several weeks or months, you’ll notice patterns in the location and frequency of their missions.

Determine all the terminals you could depart from to reach your desired destination. You’ll increase your chances of success by signing up to fly from all of them. Signing up is free and takes only a few minutes.

The AMC website details the sign-up options, including the required information. You can sign up through their website, by email or in person at the terminal. You can also use the Take-A-Hop app (which costs $6.99). If you’re signing up for several terminals, email and the Take-A-Hop app are the easiest ways to do so.

The sooner you can sign up, the better, as priority within each category is based on the sign-up date and time. So sign up as early as possible. At most terminals, your sign-up is valid for up to 60 days.

Keep in mind that your category may affect how early you can sign up for Space-A travel. For example, active-duty service members (Cat 3) must be on leave before they can sign up. Those in Cat 3, however, have precedence over those in Cats 4 through 6, regardless of when they signed up.

You must mark yourself present at the terminal before roll call to let the staff know that you are competing for the flight. You can do so anytime within 24 hours of the scheduled roll call. Note: roll call times can change unexpectedly, so continually monitor the terminal’s 72-hour flight schedule to ensure you get there in time or, better yet, call the terminal to confirm.

Bring your military ID and any necessary documents, such as your passport, your leave form or your EML orders. If you are an unaccompanied dependent, you’ll need a memo from your sponsor’s command. Also bring a copy of your sign-up email as a backup to prove your sign-up date and time.

At roll call, terminal staff will announce how many Space-A seats are available for the flight and then the names of the selected passengers,  beginning with those in the highest-priority category.

If they call your name, go to the desk and confirm that you and any dependents traveling with you are present. You’ll need to show your military ID and any required paperwork, as well as ID cards for passengers older than 10 years old. For younger passengers,  bring their passports or MilConnect printouts that show the Department of Defense ID numbers.

If they don’t call your name, don’t leave the terminal just yet. Sometimes last-minute Space-A seats become available, so stay at the terminal until boarding time.

Once you and all members of your traveling party, along with all your luggage, must be present when the baggage check begins. This may be right after roll call, or it may be several hours later. You will need to stay in the terminal, as boarding times, like roll call times, can change without notice.

The AMC website’s FAQ page includes detailed information on baggage allowances. Because smaller aircraft may have different weight limits for luggage, it’s best to check ahead of time.

You will generally be allowed to check two pieces of luggage weighing up to 70 lbs each. Similar to many commercial flights, you can also bring one piece of carry-on luggage that fits under your seat or in the overhead compartment. You can usually check car seats and strollers, and they won’t count toward your baggage allowance.

AMC terminals follow the Transportation Security Administration’s baggage screening guidelines , so check their website ahead of time to see what you can bring in your carry-on bag, and what you must put in checked luggage.

Check if meals are available on the flight, as you’ll pay for these when you check your luggage. Some locations offer simple box lunches for a nominal cost.

If you are flying Space-A on a Patriot Express flight , your boarding pass will list your assigned seat.

When terminal staff announces boarding, you’ll go through security and wait in a secure area. With most flights, a bus will take you to the aircraft, and you’ll board from the tarmac.

On most Space-A flights, you’ll choose your seat when you board. On Patriot Express flights, your boarding pass will list your assigned seat.

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Patriot Express flights offer amenities, including meals and in-flight movies. 

Other Space-A flights do not. Snacks and water may be available, but it’s best to be prepared and bring your own.

Seating depends on the type of aircraft. Some have seats that are comparable to commercial airlines. Others have web seating along the sides of the plane. If this is the case, you can stretch out if there’s room.

Patriot Express flights are climate-controlled, but other military aircraft are not. They are often cold or hot, so dress in layers. They can also be loud. The crew usually provides foam earplugs, but it’s a good idea to bring your own.

There are advantages and disadvantages to Space-A travel.

Space-A flights can save you hundreds or thousands of dollars over commercial airlines, which is a clear advantage. The only costs you might incur are a low per-passenger fee on Patriot Express flights, and you may be able to purchase low-cost meals at some terminals that offer meals for purchase.

When you land, you’ll be able to access base resources, including overnight base lodging and the commissary. You may even be able to purchase discount tickets to local events and attractions through the base’s Information, Tickets and Travel office (ITT).

Being able to stretch out on some aircraft can be another advantage over flying economy in a commercial plane. 

If you’re traveling with small children, you may also find that other passengers are more supportive than with a commercial airline.

And, of course, there may be a greater sense of adventure with Space-A travel.

• Free or low-cost air travel
• Access to base amenities (Base Exchange, Commissary, MWR, ITT, etc.)
• Possibly more space to spread out compared to commercial airlines
• It’s an adventure!

Space-A travel is less predictable than flying commercially. Passenger terminals post flight schedules only 72 hours in advance, and you won’t know if you got a seat until the last minute. 

Peak travel times, including summer, winter holidays, and even spring break, are even more competitive. You may need to be more flexible about when you travel and even where you’ll go.

You may incur other costs with Space-A travel, such as transportation to the base you’ll be flying from. You may need to wait for a flight home–possibly for days–and the costs of lodging and meals can quickly add up.

Finally, Space-A travel, unless you’re on a Patriot Express flight, is bare bones. You may find it cold, loud, and uncomfortable. 

• Travel and schedules can vary.
• Seats aren’t guaranteed — you must have flexible travel plans!
• Travel can be difficult during busy times (summer PCS season, holidays, etc.).
• Lodging, meals and transportation costs can add up.
• Military aircraft can be cold and uncomfortable.

If you have the time, flexibility, and patience to wait for a flight, Space-A travel can offer you an adventure while saving you a lot of money. If you’re traveling for an event, such as a wedding, and must arrive by a specific time, Space-A is not the best way to travel, especially if it’s during the peak seasons of summer, winter holidays, and spring break.

Flying Space-A requires planning, patience, and flexibility. Learn as much as you can about the process, and also research desired destinations and passenger terminals so that you can put together a successful flight plan.

When you are ready to leave, make sure you always have a backup plan and ensure you have enough money to pay for commercial transportation if Space-A doesn’t work out. Also, be prepared for a multi-legged journey–several shorter hops that bring you closer to your destination rather than one long direct flight.

About Post Author

Stephanie Montague

Stephanie Montague is the founder of Poppin’ Smoke , a website designed to encourage members of the military community to use their military benefits for travel. Stephanie and her husband have been traveling the world since he retired from the Army in 2015. Through Poppin’ Smoke, Stephanie shares everything they learn about Space-A travel and using military benefits while abroad.

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Posted In: Military & Veterans Benefits

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ray maring says

December 29, 2023 at 9:17 am

Thank you for hosting this information. I am a guardsman, retired and are interested in traveling now.

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Space A Travel: Everything You Need To Know

Julie Provost

What is Space-A Travel?

Space-A is being able to travel on DOD aircraft for free or at a limited cost. The flights you take are on a space-available basis, and the number of passengers they take will depend on the flight. Space-A can get you to many different places worldwide, but some locations are more challenging to fly to than others.

When you fly Space-A, you have to do some planning and research. You must know which Space-A category you fall into and what that will mean for flights. You will need to make sure you are eligible and have all the right paperwork. You can travel with children, but you do need to be prepared for the whole trip, and that might be more difficult than flying commercially.

What Are the Different Categories for Space-A Travel?

Those who are eligible for Space-A typically fit into one of six different categories. These categories help determine how likely it is that you can fly.

Category I : Emergency Leave Unfunded Travel- For emergency situations only.

Category II: EML (Environmental Morale Leave) for Active Duty and dependents.

Category III: Active Duty Ordinary Leave- This category also includes those on Terminal Leave as well as their accompanied dependents, those on House Hunting Permissive TDY, Medal of Honor Holders, and dependents of deployed service members as long as they are deployed for 365 consecutive days or more. It is important to note that these dependents will be selected behind active duty members no matter when they sign up.

Category IV: Unaccompanied Dependents on EML or dependents whose sponsor is deployed between and including 30-364 days as well as DODDS teachers on EML during the summer.

Category V: Unaccompanied command-sponsored and non-command-sponsored dependents of active duty, permissive TDY (non-house hunting), and students.

Category VI: 100% disabled veterans.  Retirees as well as their accompanied Dependents, reserve, ROTC, NUPOC, and CEC. The DoD adds, “Surviving Spouses of service members who died while on active duty, inactive duty training, or annual training status. as well as retired military members, and their accompanying dependents.”

Can Retirees Fly Space-A?

Retired military members who are issued DD Form 2 and eligible to receive retired or retainer pay may use Space-A travel according to the Air Mobility Command Space-A official site.

RELATED : Disabled Veterans Can Now Fly Space-A

Are You Able to Travel Without Your Service Member?

Only eligible dependents whose service member is stationed overseas can travel unaccompanied and would do so as CAT-V, with some CONUS restrictions. Those whose service member is deployed for 30 days or more may travel unaccompanied anywhere that Space-A is allowed at a CAT-III, after active duty, or CAT-IV, based on how long they are deployed, as mentioned above. If your spouse is not deployed and stationed in CONUS, you can not use Space-A unless you are with your service member.

What About National Guard or Reserve Members?

At press time, Space-A travel is authorized for National Guard/Reserve components/members of the Ready Reserve and members of the Standby Reserve who are on the Active Status List.

What Do You Have to Do to Get On A Flight?

The first step is get authorized to travel on Space-A. This means starting leave if you are on active duty or getting a travel letter if you are an unaccompanied dependent. If you are a retiree, you should be authorized when you are ready to start the process.

• Sign up and register at the locations you plan to travel to and from. You can do this at some terminals through an online form, in person, by email, or by fax. This signing up doesn’t mean you are on a flight or have an exact flight time. What you will be doing is getting assigned a date and time. This will put you in front of anyone in your category who has a later date and/or time than you do.
• Sign up as soon as possible for as many places as you think you might go. If you are unsure where you will be flying from, sign-up for all potential places. You don’t want to sign-up too far in advance so that your sign-up expires before the date you want to fly. For active duty, you should sign-up as soon as your leave starts, and that sign-up should last until your leave is over. For non-active duty, sign-ups are valid for 60 days.
• Each sign-up location is independent. Call to verify that you are signed up and carry a printed copy of your emails verifying you have done so. That way, you can show that you should be on any list you need to use to travel.

Showing Up for a Flight

• Show up before any potential flight you want to take. Flights will get posted, and you can make your plan from there. You need to mark yourself “Present” for the flight you want to go on. This tells the terminal that you are there and will be ready to fly when the time comes.
• When exactly you are marked “Present” doesn’t matter as far as where you are in line; the date and time of when you signed up does, but you would need to be marked present within 24 hours of flight time.
• It is a good idea to get to the terminal, ready to fly with all of your bags and paperwork, about an hour before what is called “Show Time.” You would then mark yourself “Present” by checking in at the desk and wait until “Show Time.” At this point, you do not want to leave the area, even to grab a bite to eat. Times can change, and you want to be ready if that happens.

Show Time and Roll Call

• “Show Time” is when “Roll Call” can begin, and it is about 2-3 hours before it would be time to fly. You need to be aware of when “Show Time” is supposed to start, as well as what time you would fly if you make it on the flight. Always give yourself extra time.
• “Roll Call” is going to be when the date and time you “signed up” for that location and the category you are in come into play. With “Roll Call,” they start with CAT-I and go through all the way until CAT-VI or until they fill all the seats. For example, someone in CAT-IV, who signed up on June 1st at 10:30 am will be ahead of someone who signed up for CAT-IV, on June 1st, at 11:30 am.  All of CAT-IV would be ahead of all of CAT-5. They might just have 10 seats, or they might have 50 seats, it depends on the flight, aircraft, and how much space they actually have on the flight.
• You will need to be right there during “Roll Call.” If you are somewhere else, and they call your name, and you don’t check-in, you will not make it on the flight. You will need to be travel-ready when this happens.
• Being “Manifested” means you are selected for a flight, and you will be going on this flight unless the flight itself is canceled or you get bumped for cargo. This is where you want to be.
• You can also be “Manifested Through,” which means you won’t have to compete for a seat on your second flight. However, you need to make sure you are “Manifested Through” to your end location. This, however, does not mean you have your round trip covered. You will have to compete for seats on your return trip.

How Much Does Space-A Travel Cost?

Many Space-A flights are free; however, if you take a Patriot Express flight, you may be charged a head tax and inspection fees. Bring cash for this flight, you may not be permitted to pay using a credit card.

You may also need to have extra money for possible stays in hotels, extra food, or even money for transportation. Because some flights get canceled, or it can be hard to get on right away, you might have to wait near the terminal for a few nights.

How Many Bags Can You Bring?

For Space-A, the nature of the mission determines how much baggage can be loaded. On some flights, you may be allowed to bring two pieces of luggage each, not to exceed 70 lbs.  For others, there may be a requirement for the bags to be under 30 lbs.

Where Can You Go For Extra Help?

• The Air Mobility Command website – This is where you can read information about how Space-A works, sign up for flights, and more.
• SpaceA.net – An informational site about the ins and outs of Space-A travel.

Other Tips For Flying Space-A?

The main thing you need to remember is that Space-A is going to require some planning. You will need to spend some time researching where you will go, how many flights they have, and how easy it might be for you to get on a flight. Certain times of the year are busier than others, and you must bring your patience.

Flights can get delayed for days. You might go through the entire process and end up on a flight, only to have to get off and start all over again because there is something going on with the plane. You need to plan for if your first idea doesn’t work out.

There are a lot of benefits to flying Space-A. You can see the world and can do so without having to spend a lot of money, but you have to understand that you will have to work for it. Some flights will be easier than others, and you just never really know what you will find when you attempt to fly Space-A.

If you need to reach your destination by a certain date, Space-A might not be the best way to get there. Unlike a commercial airline, you are not guaranteed a time and a place to fly. Being flexible and understanding is a must. If you can go into Space-A with that mindset, you can enjoy everything Space-A has to offer. 

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SpaceA.net is an unofficial site for members of the Uniformed Services/Military.  The information provided has been compiled since 2001 from online forums, individual contributions, websites, personal knowledge and regulations. Verify everything with current regulations and policy before you plan travel.

This site is FREE (like Facebook) thanks to advertisements (no membership dues or purchase requirements).  PLEASE support this site by donating "Information" to [email protected] If you have QUESTIONS then see SpaceA.net FAQs or post on the SpaceA.net FB Page

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Space Available Flight: An Overview

Space Available Flight, better known as Space A or military hops, is a unique privilege provided to servicemembers, retirees and their families. Under the Space-Available (Space A) program, eligible passengers can fill unused seats on DoD-owned or controlled aircraft once all the space-required (duty) passengers and cargo have been accommodated.

If you have the time and flexibility, Space A travel offers incredible discounts. We have gathered valuable resources to help you better understand the Space A system and prepare you for what to expect.

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That's the basic idea behind a space elevator .

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The concept of space elevators isn't new, but engineering such a structure would be no easy feat , and many other issues besides technology stand in the way.

That's why the ambition to seriously build one is fairly recent.

The Japan-based company Obayashi Corporation thinks it has the expertise.

Japan aims to build a space elevator by 2050

Known for constructing the world's tallest tower, the Tokyo Skytree , Obayashi Corporation announced in 2012 that it would reach even loftier heights with its own space elevator.

In a report that same year, the company said it would begin construction on the $100-billion project by 2025 and could start operations as early as 2050.

We checked in with Yoji Ishikawa, who wrote the report and is part of the company's future technology creation department, to see how the project is progressing ahead of 2025.

While Ishikawa said the company likely won't start construction next year, it is currently "engaged in research and development, rough design, partnership building, and promotion," he told Business Insider.

Some have doubted such a structure is even possible.

"It's been sort of a kooky idea," said Christian Johnson, who published a report on space elevators last year in the peer-reviewed Journal of Science Policy & Governance.

"That said, there are some people who are real scientists who are really on board with this and really want to make it happen," Johnson said.

A cheaper route to space

Launching humans and objects into space on rockets is extremely expensive. For example, NASA has estimated its four Artemis moon missions will cost $4.1 billion per launch .

The reason is something called the rocket equation . It takes a lot of fuel to get to space, but the fuel is heavy, which increases the amount of fuel you need. "And so you see the kind of vicious cycle there," Johnson said.

With a space elevator, you don't need rockets or fuel.

According to some designs, space elevators would shuttle cargo to orbit on electromagnetic vehicles called climbers. These climbers could be remotely powered — like through solar power or microwaves — eliminating the need for on-board fuel.

In his report for the Obayashi Corporation, Ishikawa wrote that this type of space elevator could help drop the cost of moving goods to space to $57 per pound. Other estimates for space elevators in general have put the price at $227 per pound.

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Even SpaceX's Falcon 9, which, at around $1,227 per pound, is one of the cheaper rockets to launch, is still about five times as expensive as the higher cost estimates for space elevators.

There are other benefits besides cost, too.

There's no danger of a rocket exploding , and the climbers could be zero-emission vehicles, Johnson said. At a relatively leisurely pace of 124 miles per hour, the Obayashi Corporation's climbers would travel slower than rockets with fewer vibrations, which is good for sensitive equipment.

Ishikawa said the Obayashi Corporation sees a space elevator as a new kind of public works project that would benefit all of humankind.

There's not enough steel on Earth to make a space elevator

Right now, one of the biggest obstacles to building a space elevator is what to make the tether or tube from.

To withstand the tremendous tension it would be under, the tube would have to be very thick if it were made out of typical materials, like steel. However, "if you try to build it out of steel, you would need more steel than exists on Earth," Johnson said.

Ishikawa's report suggested Obayashi Corporation might use carbon nanotubes . A nanotube is a rolled-up layer of graphite, the material that's used in pencils.

It's much lighter and is less likely to break under tension compared to steel, so the space elevator could be much smaller, Johnson said. But there's a catch.

While nanotubes are very strong, they're also tiny, a billionth of a meter in diameter. And researchers haven't made them very lengthy. The longest is only about 2 feet.

To be properly balanced while still reaching geosynchronous orbit — where objects stay in sync with Earth's rotation — the tether would need to be at least 22,000 miles long, per Ishikawa's report.

"So we're not there," Johnson said of the nanotube length. "But that doesn't mean it's impossible."

Instead, researchers might need to develop an entirely new material, Ishikawa said.

Other obstacles

Whatever the material turns out to be, there are still other problems.

For instance, a space elevator's tether would be under such incredible tension that it would be prone to snapping, Johnson said. A lightning strike could vaporize it. There's also other weather to consider like tornadoes, monsoons, and hurricanes.

Locating the tether base at the equator would lessen the likelihood of hurricanes , but it would still need to be in the open ocean to make it more difficult for terrorists to target, Johnson said.

It would also take a lot of trips to make up for that giant price tag for construction.

That's only scratching the surface of the challenges. And they can't all be solved by one company, Ishikawa said. "We need partnerships," he said. "We need different industries."

"Of course," Ishikawa said, "raising funds is very essential."

That's a lot of obstacles to overcome to start construction in time for operation by 2050, especially since Ishikawa estimated it would take 25 years to build. He noted that the 2050 estimate always came with caveats about the technology progressing. "It's not our goal or promise," he said, but the company is still aiming for that date.

"I think that those time estimates are optimistic," Johnson said, "even assuming there was a breakthrough tomorrow."

Watch: Why Hot Air Balloons Are So Expensive

• Main content

A Groundbreaking Scientific Discovery Just Gave Humanity the Keys to Interstellar Travel

In a first, this warp drive actually obeys the laws of physics.

If a superluminal—meaning faster than the speed of light—warp drive like Alcubierre’s worked, it would revolutionize humanity’s endeavors across the universe , allowing us, perhaps, to reach Alpha Centauri, our closest star system, in days or weeks even though it’s four light years away.

However, the Alcubierre drive has a glaring problem: the force behind its operation, called “negative energy,” involves exotic particles—hypothetical matter that, as far as we know, doesn’t exist in our universe. Described only in mathematical terms, exotic particles act in unexpected ways, like having negative mass and working in opposition to gravity (in fact, it has “anti-gravity”). For the past 30 years, scientists have been publishing research that chips away at the inherent hurdles to light speed revealed in Alcubierre’s foundational 1994 article published in the peer-reviewed journal Classical and Quantum Gravity .

Now, researchers at the New York City-based think tank Applied Physics believe they’ve found a creative new approach to solving the warp drive’s fundamental roadblock. Along with colleagues from other institutions, the team envisioned a “positive energy” system that doesn’t violate the known laws of physics . It’s a game-changer, say two of the study’s authors: Gianni Martire, CEO of Applied Physics, and Jared Fuchs, Ph.D., a senior scientist there. Their work, also published in Classical and Quantum Gravity in late April, could be the first chapter in the manual for interstellar spaceflight.

POSITIVE ENERGY MAKES all the difference. Imagine you are an astronaut in space, pushing a tennis ball away from you. Instead of moving away, the ball pushes back, to the point that it would “take your hand off” if you applied enough pushing force, Martire tells Popular Mechanics . That’s a sign of negative energy, and, though the Alcubierre drive design requires it, there’s no way to harness it.

Instead, regular old positive energy is more feasible for constructing the “ warp bubble .” As its name suggests, it’s a spherical structure that surrounds and encloses space for a passenger ship using a shell of regular—but incredibly dense—matter. The bubble propels the spaceship using the powerful gravity of the shell, but without causing the passengers to feel any acceleration. “An elevator ride would be more eventful,” Martire says.

That’s because the density of the shell, as well as the pressure it exerts on the interior, is controlled carefully, Fuchs tells Popular Mechanics . Nothing can travel faster than the speed of light, according to the gravity-bound principles of Albert Einstein’s theory of general relativity . So the bubble is designed such that observers within their local spacetime environment—inside the bubble—experience normal movement in time. Simultaneously, the bubble itself compresses the spacetime in front of the ship and expands it behind the ship, ferrying itself and the contained craft incredibly fast. The walls of the bubble generate the necessary momentum, akin to the momentum of balls rolling, Fuchs explains. “It’s the movement of the matter in the walls that actually creates the effect for passengers on the inside.”

Building on its 2021 paper published in Classical and Quantum Gravity —which details the same researchers’ earlier work on physical warp drives—the team was able to model the complexity of the system using its own computational program, Warp Factory. This toolkit for modeling warp drive spacetimes allows researchers to evaluate Einstein’s field equations and compute the energy conditions required for various warp drive geometries. Anyone can download and use it for free . These experiments led to what Fuchs calls a mini model, the first general model of a positive-energy warp drive. Their past work also demonstrated that the amount of energy a warp bubble requires depends on the shape of the bubble; for example, the flatter the bubble in the direction of travel, the less energy it needs.

THIS LATEST ADVANCEMENT suggests fresh possibilities for studying warp travel design, Erik Lentz, Ph.D., tells Popular Mechanics . In his current position as a staff physicist at Pacific Northwest National Laboratory in Richland, Washington, Lentz contributes to research on dark matter detection and quantum information science research. His independent research in warp drive theory also aims to be grounded in conventional physics while reimagining the shape of warped space. The topic needs to overcome many practical hurdles, he says.

Controlling warp bubbles requires a great deal of coordination because they involve enormous amounts of matter and energy to keep the passengers safe and with a similar passage of time as the destination. “We could just as well engineer spacetime where time passes much differently inside [the passenger compartment] than outside. We could miss our appointment at Proxima Centauri if we aren’t careful,” Lentz says. “That is still a risk if we are traveling less than the speed of light.” Communication between people inside the bubble and outside could also become distorted as it passes through the curvature of warped space, he adds.

While Applied Physics’ current solution requires a warp drive that travels below the speed of light, the model still needs to plug in a mass equivalent to about two Jupiters. Otherwise, it will never achieve the gravitational force and momentum high enough to cause a meaningful warp effect. But no one knows what the source of this mass could be—not yet, at least. Some research suggests that if we could somehow harness dark matter , we could use it for light-speed travel, but Fuchs and Martire are doubtful, since it’s currently a big mystery (and an exotic particle).

Despite the many problems scientists still need to solve to build a working warp drive, the Applied Physics team claims its model should eventually get closer to light speed. And even if a feasible model remains below the speed of light, it’s a vast improvement over today’s technology. For example, traveling at even half the speed of light to Alpha Centauri would take nine years. In stark contrast, our fastest spacecraft, Voyager 1—currently traveling at 38,000 miles per hour—would take 75,000 years to reach our closest neighboring star system.

Of course, as you approach the actual speed of light, things get truly weird, according to the principles of Einstein’s special relativity . The mass of an object moving faster and faster would increase infinitely, eventually requiring an infinite amount of energy to maintain its speed.

“That’s the chief limitation and key challenge we have to overcome—how can we have all this matter in our [bubble], but not at such a scale that we can never even put it together?” Martire says. It’s possible the answer lies in condensed matter physics, he adds. This branch of physics deals particularly with the forces between atoms and electrons in matter. It has already proven fundamental to several of our current technologies, such as transistors, solid-state lasers, and magnetic storage media.

The other big issue is that current models allow a stable warp bubble, but only for a constant velocity. Scientists still need to figure out how to design an initial acceleration. On the other end of the journey, how will the ship slow down and stop? “It’s like trying to grasp the automobile for the first time,” Martire says. “We don’t have an engine just yet, but we see the light at the end of the tunnel.” Warp drive technology is at the stage of 1882 car technology, he says: when automobile travel was possible, but it still looked like a hard, hard problem.

The Applied Physics team believes future innovations in warp travel are inevitable. The general positive energy model is a first step. Besides, you don’t need to zoom at light speed to achieve distances that today are just a dream, Martire says. “Humanity is officially, mathematically, on an interstellar track.”

Before joining Popular Mechanics , Manasee Wagh worked as a newspaper reporter, a science journalist, a tech writer, and a computer engineer. She’s always looking for ways to combine the three greatest joys in her life: science, travel, and food.

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Space exploration: A luxury or a necessity?

by Daniel Fillion, The Conversation

"Oh, come on Daniel, space travel is so expensive, and pointless!" These were the words of my friend Max, during a Christmas party where I was discussing my thesis project: studying places on Earth where the living conditions are so extreme, they could hold lessons for future space missions.

This disdainful attitude toward space research is actually quite common.

Space exploration is currently booming. Just think of the Artemis missions, SpaceX's ambitious plans for Mars, the deployment of the James Webb telescope or the recent "race to the moon."

A number of large-scale projects are getting the green light now, mainly from NASA, including the Artemis II mission that will carry four astronauts to the moon, which will have Canadian astronaut Jeremy Hansen aboard . This will be a first since 1972. Incredibly, it's been 50 years since the last human mission to Earth's natural satellite.

Although many people find space exploration inspiring, others are skeptical and even angered by what they see as an unjustifiable waste of resources and money on an activity that only spreads pollution to another place. This sums up the feelings of my friend Max.

In this article, I will try to prove him wrong.

Humans are explorers first

My great curiosity has led me to travel to extreme places so I can study them . But I am not the only one with this desire to explore.

In my Grade 9 history class, my teacher stood on top of her desk and, with a grave and serious tone, went on to act out Jacques Cartier's arrival in North America in her own, colorful style. A few years earlier, I had learned about how the first humans left their caves to climb mountains. One hundred and thirty years ago, humans sailed further and further south until they saw the glacial landscapes of Antarctica for the first time . At the same time, humans were attempting to dominate the skies and aiming for the beyond with planes and rockets—which is how we got to the moon.

What is the common denominator in our history? Exploration, of course.

Human nature is characterized by a propensity to travel, to look further and to discover. We are all curious by nature. If we stop wanting to explore, we stop being human.

The Earth has rings

So, my friend Max, let me invite you outside. It's a beautiful, starry night with no moon. It's a bit cold, but at least the atmosphere isn't too humid, which makes the sky more transparent. We can see stars flickering. Some are blue, others are red. And the more our eyes adapt, the more the sky reveals its secrets.

Suddenly, something else stands out. It's another light, but it's not flashing, and it's moving quite quickly. A shooting star? No, the atmosphere would have burned it up in a few seconds .

It's a satellite, one of thousands that orbit the Earth like rings. These satellites are a direct consequence of space exploration. We would be living in a completely different world without them.

Indeed, not an hour goes by in our lives when we don't use a satellite .

On the one hand, you would likely have gotten lost on your way here, Max, because there would have been no GPS to show you which exit to take. And secondly, I wouldn't have been able to help you find your way because there would be no wifi. We can push our thinking even further; agriculture, environmental monitoring, communications, the weather, even banks, all of these depend on satellites.

But how does this work? You have to understand that these satellites move so quickly they actually circle the Earth several times a day. Combined with a very large workforce, they provide a complete view of the globe. From the middle of the oceans to the highest mountains and the almost inaccessible poles, we have eyes everywhere. By drawing on this vast quantity of observations, we obtain data on changes to the earth's surface, the spread of forest fires, the movement of winds, the melting of ice and many other things, while enabling global communication and credit card transactions .

Space exploration was the trigger that enabled us to develop and operate these technologies. And it doesn't stop there.

Two birds, one stone

The practice of medicine in remote areas also benefits from space exploration. It's not easy for communities in remote areas to access health care, especially since hospitals don't always have the sophisticated equipment they need.

If you think about it, when astronauts explore space, they become a small population in a very, very remote region. It's true. What happens if someone has a really bad stomach ache? Or breaks an arm? They don't have time to come back home for treatment, so we have to react, and quickly.

Scientific research in telemedicine has developed to address this important issue, producing a number of innovative technologies. And if these are useful for astronauts, why not use them for rural populations, too?

A few years ago, three Québec researchers from different universities were working on a tiny probe that could rapidly analyze and diagnose a blood sample .

Although some prototypes are not yet on the market, others are already in widespread use, such as the ultrasound scanner designed by NASA . This scanner takes precise photos of organs and bones that can be transmitted to a doctor, who will then have crucial information on hand to recommend treatments.

In a way, space exploration provides us with opportunities to respond to urgent needs on Earth. So, Max, are you beginning to see the need for it?

Another perspective

Finally, I have to admit that I find it rather encouraging to see Russians, Americans, Japanese, Canadians and Europeans living together on the Space Station. Not so long ago, some of these countries were attacking each other with nuclear bombs. In space, no such borders exist.

Exploration brings people together. It opens our eyes to new perspectives. It shows us that we're all in the same boat together. That's pretty important, don't you think, Max?

Our planet is magnificent and unique, an oasis of impossible life. But it is fragile. We need to protect it. That's why exploring beyond the Earth should not be considered a luxury; it's an investment in our shared humanity.

So, Max, when Jeremy Hansen and his crew take off in 2025, will you be there to watch them?

Provided by The Conversation

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Travel through data from space in new 3d instagram experiences.

A new project provides special 3D “experiences” on Instagram using data from NASA’s Chandra X-ray Observatory and other telescopes through augmented reality (AR), allowing users to travel virtually through objects in space. These new experiences of astronomical objects – including the debris fields of exploded stars – are being released to help celebrate the 25 th anniversary of operations from Chandra, NASA’s flagship X-ray telescope.  

In recent years, Instagram experiences (previously referred to as filters) of NASA mission control, the International Space Station, and the Perseverance Rover on Mars have allowed participants to virtually explore what NASA does. This new set of Chandra Instagram filters joins this space-themed collection.

“We are excited to bring data from the universe down to earth in this way,” said Kimberly Arcand, visualization and emerging technology scientist at the Chandra X-ray Center. “By enabling people to access cosmic data on their phones and through AR, it brings Chandra’s amazing discoveries literally right to your fingertips.”

The new Instagram experiences are created from 3D models based on data collected by Chandra and other telescopes along with mathematical models. Traditionally, it has been very difficult to gather 3D data of objects in our galaxy due to their two-dimensional projection on the sky. New instruments and techniques, however, have helped allowed astronomers in recent years to construct more data-driven models of what these distant objects look like in three dimensions.

These advancements in astronomy have paralleled the explosion of opportunities in virtual, extended, and augmented reality. Such technologies provide virtual digital experiences, which now extend beyond Earth and into the cosmos. This new set of Chandra Instagram experiences was made possible by a collaboration including NASA, the Smithsonian Institution, and students and researchers at Brown University.

These Instagram experiences also include data sonifications of the celestial objects. Sonification is the process of translating data into sounds and notes so users can hear representations of the data, an accessibility project the Chandra team has led for the past four years.

“These Chandra Instagram experiences are another way to share these cosmic data with the public,” said Arcand. “We are hoping this helps reach new audiences, especially those who like to get their information through social media.”

The objects in the new Chandra Instagram experience collection include the Tycho supernova remnant, the Vela Pulsar, the Helix Nebula, the Cat’s Eye Nebula, and the Chandra spacecraft. The 3D models of the first three objects were done in conjunction with Sal Orlando, an astrophysicist at Italy’s National Institute for Astrophysics (INAF) in Palmero. The Cat’s Eye Nebula was created with data from Ryan Clairmont, physics researcher and undergraduate at Stanford University. Arcand worked with Brown’s Tom Sgouros and his team, research assistant Alexander Dupuis and undergraduate Healey Koch, on the Chandra Instagram filters.

The experiences include text that explains what users are looking at. The effects are free and available on Instagram on mobile devices for at least six months, and some will remain viewable in perpetuity on the Smithsonian’s Voyager 3D website.

“There is a lot of rich and beautiful data associated with these models that Healey and I looked to bring in, which we did by creating the textures on the models as well as programming visual effects for displaying them in AR,” said Dupuis.

NASA’s Marshall Space Flight Center manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science from Cambridge Massachusetts and flight operations from Burlington, Massachusetts. The Chandra X-ray Center is headquartered at the Smithsonian Astrophysical Observatory, which is part of the Center for Astrophysics | Harvard & Smithsonian.

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A Russian cosmonaut becomes the first person to spend 1,000 days in space

Associated Press

A 59-year-old Russian cosmonaut has become the first person to spend 1,000 days in space, Russian space agency Roscosmos said Wednesday.

Oleg Kononenko achieved the milestone on Tuesday, having made five journeys to the International Space Station dating back to 2008.

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His current trip to the ISS began Sept. 15, 2023, when he launched alongside NASA astronaut Loral O’Hara and compatriot Nikolai Chub.

Kononenko first took the cumulative space time record in February 2024, when he surpassed the total of 878 days, 11 hours, 29 minutes, and 48 seconds set by fellow Russian Gennady Padalka in 2015.

If Kononenko’s mission ends as scheduled Sept. 23, 2024, he will have spent a total of 1,110 days in orbit.

"There’s this awareness that you have achieved something new and important, that you’ve overcome a certain milestone, touched the unknown,” Kononenko told Russian state news agency TASS. “It gives you confidence, and pride in the work you’ve done.”

He also told TASS that his American colleagues on the ISS were among the first to congratulate him on his achievement.

The International Space Station is one of the few areas in which the United States and Russia still cooperate closely following Moscow’s invasion of Ukraine in Feb. 2022. Roscosmos announced in December that its cross-flight program with NASA transporting astronauts to the ISS had been extended until 2025.

Copyright 2024 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed without permission.

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Meet Larry Connor, the Ohio billionaire taking a submersible to the Titanic despite last summer's OceanGate implosion

Posted: June 8, 2024 | Last updated: June 8, 2024

• Billionaire Larry Connor will travel to the Titanic shipwreck site in a two-person submersible.
• Connor's voyage comes after OceanGate's submersible imploded in June 2023.
• Connor is a thrill-seeker who set a world record jumping from a hot air balloon.

An Ohio billionaire who's flown to space and explored the Mariana Trench has set his sights on a new adventure: the Titanic shipwreck.

Real estate investor Larry Connor, 74, will take the ocean voyage with Patrick Lahey, cofounder and CEO of Triton Submarines. The submersible manufacturer confirmed their collaboration in a May Instagram post , calling it "groundbreaking."

The pair told The Wall Street Journal in May that they would travel to the Titanic wreck site to prove it can be done safely after last year's OceanGate tragedy.

OceanGate CEO Stockton Rush and four other passengers died after the company's Titan submersible imploded on the way to the Titanic shipwreck site.

"I want to show people worldwide that while the ocean is extremely powerful, it can be wonderful and enjoyable and really kind of life-changing if you go about it the right way," Connor told the outlet.

Even before announcing his deep-ocean ambitions, Connor has sought thrills on land and in Earth's orbit.

Here's what we know about Connor.

Connor is a real estate investor who founded The Connor Group, which has $5 billion in assets.

Connor's entrepreneurial mindset led him to the real estate industry in 1991, when he launched Connor, Murphy, and Buhrman with only one investor, according to his company bio.

He later bought out his partners and, in 2003, created the luxury real estate investment firm The Connor Group, which is based in Ohio.

He has a $2 billion net worth, according to Forbes.

The firm's website says The Connor Group specializes in luxury apartment communities with more than $5 billion in assets in 18 US markets.

The Connor Group — with over 1,300 investors — has properties in Atlanta, Chicago, Charlotte, Miami, Phoenix, Louisville, and more.

He founded The Greater Dayton School.

The Greater Dayton School is described as "Ohio's first non-religious private school for under-resourced students" on The Connor Group's website. The official campus opened for students in November 2023, according to the school's website .

The school's website said 105 children were enrolled in Pre-K through fourth grade as of October 2023.

Connor is also passionate about racing and has over 70 wins.

Connor's bio said he's a "two-time winner of the Baja 1000 and Baja 500 in the Trophy Truck Spec class."

He also claimed first place at the Formula Atlantic National Championship in 2001 and 2002 before emerging victorious at the Petit Le Mans in 2003, his bio says.

Connor visited Mariana Trench, the deepest known place on Earth, in April 2021.

Connor's upcoming voyage to the Titanic shipwreck site won't be his first time traveling with Lahey.

The pair completed dives to the Sirena Deep, the Challenger Deep, and a seamount in the Mariana Trench over five days in April 2021, according to The Connor Group.

Connor and Lahey used the Triton 36000/2 designed by Triton Submarines. A press release from Triton Submarines said Connor and Lahey "gathered high-quality video footage and samples in the 'hadal zone,' or the area of the ocean below 20,000 ft. — the final frontier of exploration on Earth."

Scientists planned to study the information Connor and Lahey gathered on their trip for medical, commercial, and evolutionary research.

He piloted a flight to the International Space Station one year later.

Connor became the first private astronaut pilot in April 2022 when he flew members of Axiom Mission 1 to the International Space Station, his firm says. The four-person crew flew aboard a SpaceX Crew Dragon spaceship on April 8 and returned to Earth on April 25.

NASA and aerospace startup Axiom Space first announced the flight in May 2021.

"While on board the ISS, the crew completed 25 different experiments, logging over 100 hours of research," a press release from The Connor Group read. "Larry partnered with renowned medical experts at Mayo Clinic and Cleveland Clinic on four different experiments to study the heart, brain, spine and aging."

He made a world-record jump from a hot air balloon in September 2023.

Connor and four other men hold the Guinness World Record for the highest HALO — high altitude, low opening — formation skydive at 38,139 feet. The crew set the record in September 2023.

"Larry and the Alpha-5 Team prepared for over one year to make the HALO formation skydive. They jumped from a hot air balloon and made the jump to support the Special Operations Warfare Foundation (SOWF) charity," the Guinness World Record website says.

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