The approximately weeklong mission—which will take NASA astronauts Butch Wilmore and Suni Williams to the ISS and back—is intended to be Starliner’s final test flight before NASA certifies it for Commercial Crew rotation missions to the orbital laboratory. It would be the first crewed launch on ULA’s Atlas V rocket, which will send the spacecraft into orbit, and the first on the Atlas family of rockets in more than half a century.

An initial Starliner CFT launch attempt, scheduled for May 6, was scrubbed hours before takeoff due to an oscillating pressure regulation valve on the Atlas V’s upper stage. Boeing and NASA then pushed back the mission to May 10, later revising their timeline to Friday after successfully replacing the faulty valve.

Now, a new issue—involving the Starship capsule itself, rather than Atlas V—is holding up things.

NASA and Boeing on Tuesday said Starliner crews discovered a small helium leak on the spacecraft’s service module “traced to a flange on a single reaction control system thruster.”

The service module, which unlike Starliner’s crew module is expendable, is designed to power and maneuver the autonomous spacecraft. It is equipped with 28 reaction control system engines, designed by Boeing supplier Aerojet Rocketdyne, that generate 100 pounds of thrust each and stabilize the capsule in orbit. Helium allows the thrusters to fire and is neither toxic nor combustible.

Starliner teams are working to address the issue and conduct additional testing, resulting in the new target launch date of Tuesday.

“As a part of the testing, Boeing will bring the propulsion system up to flight pressurization just as it does prior to launch, and then allow the helium system to vent naturally to validate existing data and strengthen flight rationale,” the company said.

Boeing and NASA added that no further issues have arisen since the scrubbed launch on May 6.

Starliner successfully reached the ISS for the first and only time during an uncrewed test flight in 2022. But since Boeing unveiled the concept for the spacecraft in 2010, the program has been bogged down by delays. The CFT has been no exception.

NASA intends for Starliner to serve as a redundant alternative to SpaceX’s Crew Dragon capsule—which, like Starliner, was designed to ferry astronauts to low-Earth orbit destinations—in the case of a contingency, such as the one that stranded astronaut Frank Rubio in space for six months (and helped Rubio achieve a U.S. spaceflight record in the process). Crew Dragon has flown all eight Commercial Crew missions to date under a contract with the space agency agreed upon in 2014, which has since been extended.

NASA and Boeing have a similar contract, worth $4.2 billion, for six missions, the first of which could fly early next year if all goes according to plan Tuesday.

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SpaceX on Saturday unveiled its first-generation extravehicular activity (EVA) spacesuit, which will be donned by astronauts aboard the Polaris Dawn mission, scheduled for no earlier than this summer. Polaris Dawn—a five-day, four-person orbital mission to research human health both in space and on Earth—is the first of three potential human spaceflights under the Polaris Program.

SpaceX and entrepreneur Jared Isaacman, who founded the program in February 2022, held a discussion accompanying the announcement on social media platform X, formerly Twitter, which SpaceX CEO Elon Musk acquired in October..

While the mission has no firm launch date, SpaceX on Saturday confirmed that Polaris Dawn would be the next crewed mission the company will fly.

What Is Polaris?

The Polaris Program is the brainchild of Isaacman, the billionaire CEO of integrated payments provider Shift4 who is also a pilot and astronaut, with more than 7,000 flight hours and multiple experimental and ex-military aircraft ratings. Isaacman in 2012 founded Draken International, a private air force that trains pilots for the U.S. Armed Forces.

Isaacman purchased flights from SpaceX in February 2022 to launch the program and is funding Polaris Dawn himself.

Named after the constellation of three stars more commonly known as the North Star, or Polaris, the program comprises three potential missions, one for each star. The effort aims to rapidly advance human spaceflight capabilities with an eye toward future missions to the moon, Mars, and beyond. Simultaneously, it will raise funds and advance research into issues facing humanity on Earth, such as cancer.

Polaris Dawn, the first of the three missions, was announced in 2022 and expected to fly later that year. It has since been delayed multiple times, most recently from February to mid-2024, due in part to SpaceX’s development of the specially designed EVA spacesuits.

Polaris Dawn and a second mission without a timeline, simply called Mission II, will be flown using SpaceX’s Falcon 9 rocket and Crew Dragon capsule. Both vehicles are already in use by NASA and a handful of commercial customers, such as Axiom Space.

Falcon 9, a reusable two-stage rocket, is the world’s first orbital class reusable rocket and has been lauded for driving down launch costs in flying 330 times. Crew Dragon, which is capable of carrying up to seven passengers, in 2020 restored NASA’s ability to ferry astronauts to and from the International Space Station (ISS) with the first Commercial Crew rotation mission. It has flown a total of 46 missions, visiting the ISS on 42.

Polaris is expected to culminate in a third mission comprising the first crewed flight of SpaceX’s Starship, the largest and most powerful rocket ever built. Like Falcon 9, the spacecraft is designed to be fully reusable and has so far attempted three orbital test flights, each more successful than the last.

Isaacman has been outspoken about Polaris’ aim to make human spaceflight accessible to all. The new SpaceX suits, for example, are designed to fit a range of body types and accommodate all spacewalkers.

At the same time, the billionaire aviator is focused on solving problems on Earth. Since its founding, Polaris has worked closely with St. Jude Children’s Research Hospital and helped fund research into childhood cancer.

Civilians in Space

Polaris Dawn is notable for its four-person crew, which includes the first SpaceX employees expected to actually reach space.

Mission specialist Sarah Gillis oversees the company’s astronaut training program, while mission specialist and medical officer Anna Menon manages crew operations. Gillis, trained to be a classical violinist, joined SpaceX in 2015, while Menon is a seven-year NASA veteran. But both have been part of past Crew Dragon flights. Menon in particular was influential in developing Dragon’s crew and emergency response capabilities.

Joining the SpaceX employees will be pilot Scott Poteet, a retired Air Force lieutenant colonel with more than 3,200 flying hours in the F-16, A-4, T-38, T-37, T-3, and Alpha Jet.

Isaacman himself will serve as Polaris Dawn mission commander, a role he also filled for  SpaceX’s 2021 Inspiration4 mission: the first all-civilian mission to space. Poteet, who previously served in roles at Isaacson’s companies Shift4 and Draken, was mission director for that flight, which raised $250 million for St. Jude.

To prepare for Polaris Dawn, crewmembers lived inside the decompression chamber at NASA’s Johnson Space Center in Houston for two days, summited the 16,800-foot peak of Illinizas Norte volcano in Ecuador, and experienced 9 Gs of force while training on three different kinds of fighter jets.

The mission will launch from Launch Complex 39A at Kennedy Space Center in Florida. The crew will spend up to five days in orbit, performing about 40 experiments and testing of hardware and software. Like Inspiration4, it is a charitable effort, with the goal of raising additional funds for St. Jude.

“Fifty or 100 years from now, people are going to be jumping in their rockets, and you’re going to have families bouncing around on the moon with their kids at a lunar base,” said Isaacman in an article on the St. Jude website. “If we can accomplish all of that, we sure as heck better tackle childhood cancer along the way.”

Polaris Dawn aims to fly higher than any SpaceX Dragon mission to date, a height that hasn’t been reached since the end of the Apollo program half a century ago.

The crew will also attempt to reach the highest Earth orbit ever flown. Isaacman during the discussion on X said the mission will target an apogee of 1,400 kilometers, or about 870 miles, more than double the orbital height reached by Apollo 17. That orbit would place the crew just inside the Van Allen radiation belt, where it hopes to research effects of spaceflight and space radiation on human health.

“The benefit of being at this high altitude is that we can better understand the impacts of that environment…on both the human body…as well as on the spacecraft,” said Menon during the discussion on X.

Suit Up

The Dragon capsule will complete seven elliptical orbits until reaching its apogee before descending to a circular orbit at about 700 kilometers (435 miles). At that altitude, crewmembers will attempt the first commercial spacewalk. It would also be the first time four astronauts have been exposed to the vacuum of space at the same time, according to SpaceX.

The spacewalk will mark the first use of SpaceX’s EVA spacesuit in low-Earth orbit, a key milestone that is expected to inform future iterations of the design for long-duration missions.

It’s an evolution of SpaceX’s Intravehicular Activity (IVA) suit that has been modified to enable both intra and extravehicular use. In other words, personnel won’t need to change clothes when moving from the confines of the spacecraft to the harsh environment of space.

The EVA suit adds greater mobility, seals and pressure valves, a helmet camera, and textile-based thermal material, which regulates suit temperature and can be controlled using a dial. Boots were constructed from the same thermal material used to shield Falcon and Dragon from exposure.

“There was a lot of work on both the materials of the suit, developing a whole new layer that we needed to add for thermal management as well as looking at the thermal condition for the crewmembers themselves, and making sure that they were at a comfortable temperature inside the suit,” said Chris Drake, manager of SpaceX’s spacesuit team, on Saturday.

The 3D-printed helmet incorporates a new visor designed to reduce glare as well as a state-of-the-art, heads-up display (HUD). The HUD is active only during spacewalks and displays spacesuit pressure, temperature, and humidity, as well as a mission clock to track how long the astronauts are exposed to the vacuum of space.

Already, SpaceX is developing a second-generation EVA suit for missions to the moon and Mars. It estimates that millions of suits will be required to one day build a lunar base or Martian city.

“This is important because we are going to get to the moon and Mars one day, and we’re going to have to get out of our vehicles and out of the safety of the habitat to explore and build and repair things,” Isaacman said during the discussion on X.

The Dragon capsule has also required modifications to prepare for the landmark spacewalk. SpaceX on Saturday said a structure called “Skywalker” has been attached near the capsule’s hatch to act as a mobility aid. Handrails and foot rails have been installed inside the spacecraft, with a ladder interface added to the hatch opening.

SpaceX also installed a cabin pressurization system that allows the interior of the capsule to withstand the vacuum of space as air is sucked out during the spacewalk. A repressurization system will stabilize it once the astronauts return.

Why It Matters

In addition to achieving the first commercial spacewalk and the highest orbital altitude ever recorded, Polaris Dawn hopes to test Starlink laser-based communications in space for the first time. Data from the test could help develop space communications for future missions.

In addition, Polaris and SpaceX selected 38 scientific experiments from 23 partner institutions—including NASA, the U.S. Air Force Academy, and Embry-Riddle Aeronautical University—intended to advance the understanding of human health in space and on Earth.

The crew will use ultrasound to study decompression sickness, for example, and will research spaceflight associated neuro-ocular syndrome: a disease unique to humans who fly in space that can have severe debilitating effects. Upon landing, astronauts will undergo tests to study anemia—an unavoidable effect of traveling to space—and other conditions that might impact humans on Earth.

The scientific aims of the Polaris Program differ from the commercial spaceflight ventures offered by companies such as Blue Origin and Virgin Galactic, which could be classified more aptly as space tourism operations.

Tickets for those companies’ orbital and suborbital offerings, some of which involve research, can range from the hundreds of thousands of dollars to the millions. Isaacman and SpaceX’s Inspiration4, meanwhile, raised a quarter of a billion dollars for cancer research.

Isaacman has been particularly outspoken when it comes to accessibility in spaceflight. And by taking on much of the risk himself, the billionaire businessman has lessened the pressure on SpaceX. Isaacman’s funding of Polaris Dawn has allowed the company to focus on developing the spacesuits and other technology necessary to ensure the mission runs smoothly.

Polaris Dawn also represents a critical juncture for SpaceX’s Starship, the lynchpin of the company’s planned human spaceflight offerings. The largest rocket ever built is not quite ready to fly humans. But when it is, the third Polaris mission is expected to be its maiden voyage.

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SpaceX this week quietly added a “Human Spaceflight” tab to its website, listing four destinations to which customers can book flights: Earth orbit, the ISS, lunar orbit, and Mars. It is unclear when the new offerings were added.

Pricing information for the missions does not appear to be available. But the webpage directs customers to an email address, humanspaceflight@spacex.com, where they can inquire to book a flight. Missions will begin later this year, the page says, starting with flights to Earth orbit.

FLYING reached out to that email and SpaceX’s press email but did not receive an immediate response.

SpaceX describes its Earth orbit missions as offering a view of the planet from 300 kilometers up. The missions, seating two to four passengers, will last three to six days, offering 360-degree views.

According to the webpage, seats and “on-orbit research opportunities” will be available in late 2024. Regarding the latter offering, SpaceX says it is seeking “exceptional science and research ideas” to study ways to make life in space and on other planets a possibility.

The in-orbit research missions would be facilitated by the company’s Dragon capsule, which since 2012 has ferried more than 1,000 research experiments to low-Earth orbit and the ISS. Customers can submit a research proposal, which SpaceX will either accept or decline. If accepted, the applicant will put together a detailed plan, working with the company to finalize a mission profile, train crews, certify hardware, and collect data.

Two human spaceflight research opportunities are listed on SpaceX’s website: fitness-focused and exploration-focused research. The latter centers largely on the development of medical capabilities for long-duration missions—perhaps to Mars, for example. Mental and physical health and virtual or augmented reality are listed as areas of research interest.

“All Dragon and Starship missions have the ability to conduct scientific research to improve life back on Earth as well as raise awareness to a global audience,” the page reads.

Ten-day commercial missions to the ISS, according to SpaceX, will be available as early as 2025. These would transport up to four people or 192 kilograms of cargo to the orbital laboratory, where passengers could conduct research or simply pay a visit.

Missions to lunar orbit and Mars do not have listed timelines. But the webpage advertises seven-day trips around the moon with up to 12 passengers, with private quarters included. A mission profile for flights to Mars simply lists the Red Planet’s day length, force of gravity, and average distance from Earth.

For all missions, passengers will don a 3D-printed helmet “with customized padding [that] houses microphones for communication and valves that regulate the suit’s pressure systems,” per SpaceX’s description.

The vehicles listed under the Human Spaceflight tab are the Dragon capsule, which is already in use by NASA, and Starship, the reusable upper stage of the company’s massive spacecraft.

Starship and SpaceX’s Super Heavy launcher combined form the largest and most powerful rocket ever constructed, standing close to 400 feet tall when stacked. However, the gargantuan vehicle has been grounded after each of its three uncrewed orbital test flights.

Interestingly, the addition of human spaceflight offerings to SpaceX’s website suggests that the company expects to build on Starship’s most recent flight, and quickly—fast enough to offer missions to lunar orbit in the not-so-distant future. The jumbo rocket is also a key component of NASA’s Artemis II and Artemis III missions to the moon’s orbit and surface, respectively.

SpaceX is not the only company to offer cosmic tourism for paying customers, nor will it be the first to actually deliver on that offering.

Blue Origin in 2021 was the first to fly humans beyond the atmosphere, ferrying CEO Jeff Bezos and Star Trek icon William Shatner to the edge of space. Virgin Galactic followed in June 2023 with its inaugural commercial launch and is now offering monthly suborbital flights for a few hundred thousand dollars per ticket.

Musk and SpaceX’s ambitions, however, are grander than those of their rivals, culminating in the establishment of human colonies on the moon and other planets. But first the company will need to prove it can safely fly humans around the Earth.

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Boeing’s CST-100 Starliner, a semireusable vessel to the ISS that has been marred by nearly a decade of delays, will finally make its first crewed flight test on Monday, barring any further hiccups. Boeing on Friday confirmed that NASA gave Starliner the “go to proceed.”

If the mission—intended to be Starliner’s final test flight—is successful, NASA will work to certify the spacecraft for routine, six-month crew rotation missions to the space station, beginning with Starliner-1, scheduled for 2025. Starliner’s crew capsule is designed to be reusable over 10 missions.

Commercial Crew is one of the linchpins of U.S. space exploration efforts. The program—a public-private partnership between NASA and companies such as Boeing, SpaceX, and Blue Origin—transports and swaps out the astronaut crews responsible for critical research on the orbital laboratory.

Used by astronauts and private companies from around the world, the space station is the only facility that allows researchers to investigate the effects of long duration spaceflight as NASA gears up for future missions to the moon, Mars, and beyond.

Since crew rotation missions began in 2020, all eight missions—including Crew-8, which is still in progress—have been facilitated by SpaceX’s Crew Dragon. The missions have also used the company’s Falcon 9 launch vehicle.

Boeing—which since 2014 has battled SpaceX for supremacy in the commercial crew program—has yet to launch a crewed flight of its Starliner, which NASA views as a redundant but important alternative to Crew Dragon. But the manufacturer on Monday has a chance to throw its hat in the ring.

“As the final flight test for Starliner, NASA’s Boeing Crew Flight Test will validate the transportation system, including the launch pad, rocket, spacecraft, in-orbit operational capabilities, and return to Earth with astronauts aboard,” NASA said in a mission profile on its website.

A successful crewed flight test would represent the final barrier to the start of Boeing’s commercial contract with NASA, under which the partners are obligated to complete six crew rotation missions. These would represent the manufacturer’s first commercial human spaceflight missions. SpaceX, so far, has flown astronauts to the space station 11 times.

A Decade of Delays

Commercial Crew is NASA’s effort to transport astronauts to the ISS from American soil, using U.S.-built rockets and spacecraft. By involving private companies such as Boeing, a rarity for the agency in years past, the idea was to reduce costs and complexity while keeping missions safe and on schedule.

Boeing unveiled the concept for the CST-100 Starliner—with CST standing for Crew Space Transportation and 100 denoting the Kármán Line, a boundary 100 kilometers above the Earth informally considered to be the edge of space—in 2010. The manufacturer claimed the spacecraft could be operational within five years.

That prediction did not come to fruition. By 2014, NASA had narrowed down its search for a reusable Commercial Crew capsule to two candidates: Starliner and SpaceX’s Crew Dragon.

Each company was awarded billions of dollars to build and certify an aircraft by 2017, the year they were expected to be ready for a first crewed flight test. Boeing’s $4.2 billion contract includes six service missions plus uncrewed and crewed test flights to the space station.

Neither company met its deadline. But Crew Dragon made its first flight with astronauts in 2020. The same can not be said for the Starliner program, which for nearly a decade has been bogged down by delays.

The first uncrewed Starliner Orbital Test Flight Mission, scheduled for 2017, was delayed three times to 2019. Half an hour into that flight, an anomaly forced NASA to abort a planned docking with the space station. Though the mission to the orbital laboratory was scrapped, the spacecraft was safely recovered.

A second uncrewed orbital test flight, OFT-2, was also delayed more than a year due to valve problems late in the initial countdown. It eventually launched in 2022, reaching the ISS for the first time and meeting all mission objectives.

The prelude to Starliner’s first crewed test flight sounds like a familiar tune. The mission was pushed back several times in 2023, culminating in an indefinite delay caused by a pair of issues discovered just weeks before a planned launch in July.

All told, the program has overrun planned costs by $1.5 billion. According to a NASA Office of the Inspector General report, the space agency committed to additional flights and payments not specified in its original contract, in a bid to keep Boeing as a contractor.

The delays to Starliner have forced NASA to put all of its eggs in SpaceX’s basket, jeopardizing Commercial Crew missions should Crew Dragon—which so far has proven reliable—experience issues. But with the agency giving its all clear last week, the long-awaited rocket spacecraft appears set to finally make its debut.

The Mission

Starliner was designed and built by Boeing with the help of more than 425 suppliers. Early missions, including next week’s planned flight, will be launched by United Launch Alliance’s Atlas V launch vehicle. But the spacecraft is billed as “launch vehicle agnostic,” compatible with vehicles in the medium-lift launch class.

Starliner’s unique weldless structure was devised with reusability in mind. Its service modules are expendable, but its crew module can be reused up to 10 times, according to Boeing. The crew module can fit seven crewmembers, but NASA missions will include four or five astronauts.

Combined, the crew and service modules have 40 reaction control system thrusters, which aid in control and steering. While the vehicle is designed to be autonomous, Boeing has trained the crew to be able to take over.

The service module has an additional 20 orbital maneuvering and attitude control thrusters and four launch abort engines, which, combined with a pusher abort system, provide an escape route in the case of emergency during launch or ascent. Stacked on top of Atlas V, the spacecraft stands just over 170 feet.

Commander Barry “Butch” Wilmore and Pilot Sunita “Suni” Williams will command next week’s planned mission. Both are experienced NASA astronauts with multiple spaceflights in the books. During the crewed test flight, Wilmore and Williams will be the first to launch on Starliner and Atlas V and manually control Starliner.

The astronauts’ goal will be to validate the transportation system, including the launch pad, rocket, spacecraft, and in-orbit capabilities, for future missions. 

Before, during, and after their weeklong stay on the space station, the crew will perform an array of tests designed to support the spacecraft’s certification. These include evaluations of equipment such as suits and seats from prelaunch through ascent, as well as assessments of communications, manual and automated navigation, life support systems, and thrusters while aboard the orbital lab.

Boeing has been “tasked with operating the entire mission,” including launch, in-orbit operations, landing, recovery and refurbishment. The company is also responsible for crew training, mission planning, spacecraft and launch vehicle assembly, and testing and integration.

Starliner arrived at Cape Canaveral Space Force Station in Florida on April 16, where it will launch from historic Space Launch Complex-41. To this point, the launch pad has only hosted uncrewed spacecraft. The spacecraft has already been stacked, with crew preparations well underway.

About 15 minutes into the mission, the Starliner capsule will separate from the booster. Orbital maneuvering and attitude control thrusters will kick in about 30 minutes in, performing an engine burn to align it in orbit and start the approximately daylong sojourn to the space station.

Cameras onboard the capsule will pick out the moving laboratory from among a sea of fixed stars as it approaches to within a few hundred feet over the following few hours. Once flight controllers give the all clear, Starliner will approach and dock autonomously with one of two Boeing-built docking adapters—another critical test.

NASA will provide continuous coverage leading up to the docking through the opening of the hatch. On Thursday, four crewmembers already aboard the space station will relocate a Crew Dragon capsule to a different docking port, making way for the SpaceX rival’s alternative.

After spending a few days evaluating the spacecraft and its systems, Wilmore and Williams will return to Starliner, which will slowly undock from the space station and position itself over the Pacific Ocean. The service module will slow it from orbital speeds of about 17,500 mph as the crew module detaches. It will then accelerate back to Earth into a parachute landing in the Western U.S., touching down at just 4 mph.

What It Means

Starliner’s first crewed test flight has plenty of implications for Boeing, NASA, and U.S. ambitions in space more broadly.

On the commercial side, failure could deal a blow to the aerospace giant, which is under contract for six NASA service missions following the flight. The company also has ambitions to attract other customers, such as Jeff Bezos’ Blue Origin, describing NASA as Starliner’s “anchor customer.”

The test flight comes as Boeing rival SpaceX continues to thrive. Before Boeing completes its first crewed mission to the space station, its rival has already completed 11 such missions—eight crew rotation missions and three private astronaut missions with customer Axiom Space—and is preparing to fly astronauts to the moon on NASA’s Artemis III.

In addition, Boeing plans to sell the extra fifth seat on its NASA missions to private and commercial- or government-sponsored astronauts. Any ambitions for private commercial spaceflight will depend on next week’s mission.

NASA would also suffer from another setback to Starliner. The space agency hopes for the space station to be continuously crewed as it uses the orbital laboratory to explore future missions to more distant destinations, such as the moon or Mars. At the moment, it is too reliant on SpaceX.

“Our hearts and souls are in this spacecraft, and a little part of us will be lifting off with Butch and Suni,” said Dana Hutcherson, deputy manager of NASA Commercial Crew and a 13-year veteran of the program.

NASA envisions visiting spacecraft such as Starliner being used as “safe havens” in the event of a contingency aboard the space station, such as depressurization, fire, or potential collision.

One such contingency took place in December 2022, when the Soyuz MS-22 capsule that transported NASA astronaut Frank Rubio to the space station sprung a coolant leak, stranding Rubio and two Roscosmos cosmonauts in orbit for months. Rubio’s 355 consecutive days aboard the ISS—his first stint in space—are now a NASA spaceflight record.

SpaceX has been a reliable partner for NASA, having not suffered an incident in service thus far. But the agency wants a contingency plan. For example, in Rubio’s case, NASA was prepared to get its astronaut home in an extra seat on a scheduled Crew Dragon launch. The backup spacecraft was not needed, but it could have rescued Rubio had Roscosmos not delivered a replacement Soyuz in time.

Boeing is also developing launch vehicles for planned NASA lunar landings during Artemis II and Artemis III. Starliner is further intended to transport personnel to the Orbital Reef, a new space station under development by Blue Origin in partnership with NASA.

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The multinational crew of Axiom Mission 3 (Ax-3)—the first all-European commercial astronaut mission to the space station—docked with the orbital laboratory Saturday morning and will spend two weeks conducting more than 30 experiments for NASA and its countries’ respective space agencies.

Wednesday marked the crew’s fourth day aboard the space station and the seventh day of its mission. Astronauts are now well underway conducting microgravity research, educational outreach, and commercial activities.

“The four Ax-3 crewmembers had their hands full as they explored cancer research, space botany, and robotics for Earth and space benefits,” NASA said in a blog post Tuesday.

Ax-3, the third private astronaut mission to the space station chartered by Houston-based Axiom Space, lifted off Thursday from Launch Complex 39A at the Kennedy Space Center in Florida. The SpaceX Crew Dragon capsule carrying the four-person crew was launched using a powerful Falcon 9 rocket, which the Elon Musk-owned company also uses to deploy Starlink satellites and conduct Commercial Crew rotation missions for NASA.

Axiom Space chief astronaut Michael Lopez-Alegría, a Spanish-born former NASA astronaut, is commanding the mission. Lopez-Alegría has made six trips to the space station, including as the commander of the company’s Ax-1 mission in 2022.

The crew also includes mission specialist Alper Gezeravcı, who became the first Turkish astronaut in space. European Space Agency (ESA) project astronaut Marcus Wandt of Sweden and pilot Walter Villadei of Italy—who also flew a commercial spaceflight mission for Virgin Galactic last year—round out the crew.

The Crew Dragon spacecraft docked with the space station Saturday morning, making Ax-3 the third mission with a fully private crew to arrive at the orbital lab. The astronauts were greeted by the Expedition 70 crew—NASA’s 70th long-duration mission to the space station—which helped them adjust to life in zero gravity and get the lay of the land.

The Expedition 70 team, which comprises NASA, ESA, and Japan Aerospace Exploration Agency (JAXA) astronauts and Roscosmos cosmonauts, arrived in August on the Crew-7 Commercial Crew rotation mission for a monthslong stay.

Now the Ax-3 and Expedition 70 teams—a total of 11 crewmembers from more than half a dozen nations—are living and working together on a two-week dual mission.

“The crew has seamlessly adjusted to microgravity and are now busy conducting research and outreach engagements,” Axiom Space said in a blog post on Tuesday.

The more than 30 experiments being conducted will focus on low-Earth orbit, such as the effects of microgravity on the biochemistry of neurodegenerative diseases (Alzheimer’s, for example). One study will monitor cancerous tumors in microgravity, aiming to identify early warning signs and prevent and predict cancer diseases.

Wandt carried out a pair of outlandish experiments. On Tuesday, he used a laptop computer to command a team of robots on Earth, testing the ability for explorations on other planets to be controlled remotely from spacecraft. Wandt also recorded his brain activity to study how isolated environments affect an astronaut’s cognitive performance and stress levels.

Beyond human-centric research, Ax-3 crew members also conducted a space botany experiment. Researchers studied how space-grown plants responded to the stress of microgravity. The aim is to uncover better agricultural practices both in space and on Earth, including the possibility of genetic modifications to adapt plants to weightlessness.

The Ax-3 crew is expected to depart the space station on February 3, splashing down off the coast of Florida. NASA in August tapped Axiom Space for a fourth private astronaut mission to the orbital lab, with a launch targeted for August at the earliest. The mission is similarly expected to fly on a SpaceX Crew Dragon and span two weeks.

NASA’s relationship with Axiom Space actually extends beyond trips to the space station. The company was selected to provide next-generation spacesuits for Artemis III, NASA’s planned attempt to return Americans to the lunar surface. Testing on the spacesuits began earlier this month, the same day NASA pushed the Artemis III timeline from 2025 to 2026.

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The space tourism firm on Sunday launched Ax-2, its second private astronaut mission to the International Space Station in conjunction with Houston-based space infrastructure developer Axiom Space. 

The launch is SpaceX’s third fully commercial flight and its 10th crewed mission to space. And it’s backed by NASA, which has agreed to support two private space tourism missions per year. The collaborative team secured one of FLYING’s Editors’ Choice Awards in 2020.

Ax-2 launched from Kennedy Space Center’s Pad 39A Sunday evening in Florida, sending four people—three paying customers and one longtime NASA astronaut—hurtling toward the space station aboard SpaceX’s Crew Dragon capsule.

Crew Dragon took off on top of SpaceX’s Falcon 9 rocket, whose reusable lower stage booster separated from the capsule and landed vertically on the pad about eight minutes after launch.

“If SpaceX can perfect their launch infrastructure and produce a rapid-turnaround capability for these vehicles, it would greatly reduce the human effort and processing time required to fly space missions,” David Cunniff, a space strategist for national security firm Peraton, told FLYING. “Workforce labor is one of the largest cost elements in the space industry.”

The capsule then separated from Falcon 9’s upper stage as planned, arriving and docking at the space station Monday morning.

Now the crew will spend eight days aboard the satellite, conducting more than 20 experiments supporting research on cancer, DNA, the impact of gravity on inexperienced astronauts, and more. That will support Axiom’s goal of developing its own independent commercial space station when the ISS is retired at the end of the decade. Axiom will even begin adding its own rooms to the space station, with plans to later remove them and form a stand-alone outpost.

After learning from the space station’s current occupants, the crew will return to Earth, splashing down off the coast of Florida.

“This journey is the culmination of long hours of training, planning, and dedication from the crew and the entire Axiom Space team, our partners at SpaceX, and of course, a credit to NASA’s vision to develop a sustainable presence in low-Earth orbit,” said Michael Suffredini, president and CEO of Axiom.

The Ax-2 crew is led by Peggy Whitson, an Axiom employee and former NASA astronaut who has spent more time in space than any American or woman in history.

“Good to be here. It was a phenomenal ride!” Whitson radioed to SpaceX Chief Engineer Bill Gerstenmeier, who congratulated the crew from the ground after Crew Dragon separated from Falcon 9.

Three more crew members paid an undisclosed fee to Axiom for their seats: pilot John Shoffner, an American racecar driver, investor, and businessman; Ali al’Qarni, a fighter pilot in the Royal Saudi Air Force; and stem cell researcher Rayyanah Barnawi, the first Saudi Arabian woman in space.

“We are now living a dream that we did not expect to become a reality,” Barnawi said Sunday after reaching the space station. “This trip represents Saudis and the entire Arab world. It is also an opportunity to discover space.”

Ax-2 follows Axiom’s 2022 Ax-1 mission, the first privately crewed launch to the ISS, which sent another former astronaut and three paying customers to space. It’s also a milestone for SpaceX, which is rapidly becoming the leader in commercial space travel and is currently evaluating last month’s Starship test launch to identify areas of improvement.

“SpaceX has often used ‘failures’ as valuable data gathering events,” Cunniff said of the attempt. “One might say that they have re-defined what a failure is for the industry, as any mission or launch activity can and does produce valuable data that can be useful for future successful attempts. Often, this data is obtained at much lower cost (and in less time) than otherwise required for a rigorous engineering analysis and test series.”

While it’s unclear how large of an impact Ax-2’s research efforts will have on the creation of a new space station, the mission undoubtedly will give NASA, SpaceX, and Axiom more information to use in future missions.

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