For the first time ever, a crew of private spacefarers have pulled off a daring orbital maneuver that until now had only been left up to government astronauts.
In the predawn hours of Thursday, the crew of the Polaris Dawn mission suited up in specially-designed SpaceX gear in preparation of enduring the vacuum of space some 435 miles above Earth. When billionaire entrepreneur Jared Isaacman and SpaceX employee Sarah Gillis then exited their SpaceX Dragon capsule, they became the first commercial astronauts to ever do so.
Because the Dragon has no airlock, the other two members of the crew, Anna Menon and Scott “Kidd” Poteet, were also exposed to the conditions of space despite remaining in the vehicle.
The pioneering private spacewalk came on the third of the five-day Polaris Dawn mission, which Isaacman is commanding and helping to fund along with SpaceX. The first of three missions under the Polaris Program, the venture is intended to test technology that could one day make SpaceX founder Elon Musk’s vision of crewed trips to Mars a reality.
When the mission launched Tuesday, the SpaceX Dragon capsule bearing the astronauts traveled further into space than any spacecraft has gone in more than 50 years, surpassing the height reached by NASA’s Gemini 11 in the 1970s, SpaceX said.
Rewatch Polaris Dawn launch: Video shows SpaceX rocket launch 4-member crew for daring commercial mission
Two exit SpaceX Dragon for commercial spacewalk
Preparations for the spacewalk began after the astronauts reached orbit on Tuesday.
Shortly after liftoff, the Dragon’s pressure began to slowly lower while oxygen levels inside the cabin increased, helping to purge nitrogen from the crew members’ bloodstreams. The protocol was to prepare the astronauts for the spacewalk and lower the risk of decompression sickness, SpaceX said.
After the spacecraft reached a maximum height of about 870 miles above Earth’s surface, the Dragon was to descend to a cruising orbit about 435 miles above Earth for the spacewalk itself.
When it came time around 6 a.m. Thursday to conduct the maneuver, Isaacman was the first to venture out of the Dragon into the weightlessness of space. As he emerged from the forward hatch, the adventurer and experienced pilot soaked in the stunning view.
“Back at home we all have a lot of work to do, but from here Earth sure looks like a perfect world,” Isaacman said as the ground crew on the livestream burst into applause.
Gillis followed him shortly afterward, climbing out the “Skywalker” ladder at the top of the capsule to catch her first glimpse of the expanse of space. Gillis, an engineer who oversees astronaut training at SpaceX, was participating with the additional benefit of gaining invaluable experience to train future astronauts, SpaceX officials have said.
Gillis was then able to reenter the vehicle and securely latch and close the hatch so that the crew could begin repressurizing the cabin.
All 4 Polaris Dawn astronauts exposed to the vacuum of space
Until now, spacewalks have only ever been the purview of government spacefarers such as NASA astronauts and Russian cosmonauts. What’s more, the maneuvers most often take place in craft with airlocks.
But because the Dragon does not have an airlock, the entire spacecraft had to be depressurized when the hatch was opened, exposing the entire crew to the vacuum of space. For that reason, even mission specialist Menon and pilot Poteet needed to wear extravehicular activity (EVA) suits designed by SpaceX to receive oxygen through tethers.
Not only have spacewalks historically not been commercial endeavors, but those who have taken part have done so in spacesuits regulated by a government space agency.
This time it is all being done by SpaceX. The purpose of the operation, which took about two hours, was to test the suit’s capabilities, which the rocket company developed for this flight.
What is the Polaris Dawn mission?
Polaris Dawn is the first of three human spaceflights under the Polaris Program, all of which are intended to test SpaceX technologies needed to carry humans deep into the cosmos.
Isaacman, founder of internet company Shift4 Payment, is the only member of the Polaris Dawn crew to have been to outer space before. Menon and Gillis are also now not only the the first SpaceX employees to travel to space, but have traveled higher than any other women in history.
The crew have already been testing a new laser-based satellite communication system using Starlink.
Before and after the spacewalk, the crew is also conducting nearly 40 scientific experiments – many of which aim to understand the human body’s reaction to long spaceflights as NASA and other space agencies set their sights on destinations like Mars.
The SpaceX Dragon will return the Polaris Dawn astronauts to Earth on Sunday, making a splashdown landing off the Florida coast.
This article originally appeared on USA TODAY: Polaris Dawn crew make historic commercial spacewalk on SpaceX Dragon