More than 435 miles (700km) above our heads, the crew of SpaceX’s Polaris Dawn mission is making history as they embark on the world’s first private spacewalk.Shortly before midday today, billionaire Jared Isaacman became the first ever non-professional astronaut to step out into the vaccum of space. ‘Back home we have a lot of work to do, but from here Earth sure looks like a perfect world,’ said Isaacman as he stepped out into space. Isaacman and mission specialist Sarah Gillis have both now completed their spacewalks and returned their spacecraft. Today, Jared Isaacman (pictured) and the Polaris Dawn crew succesfully undertook the first ever private space walk  More than 435 miles (700km) above our heads, the crew of SpaceX ‘s Polaris Dawn mission is making history as they embark on the world’s first private spacewalk SpaceX confirmed that the four-hour window for the spacewalk would take place at 05:58 ET (10:58 BST).’On Thursday, September 12 the Polaris Dawn crew will attempt the first-ever spacewalk – also known as an extravehicular activity (EVA) – from Dragon,’ it explained. ‘The EVA is targeted to start at 5:58 a.m. ET. If needed, a backup opportunity is available on Friday, September 13.’Onboard the SpaceX Dragon spacecraft are billionaire Jared Issacman, former airforce commander Scott ‘Kidd’ Poteet, and SpaceX employees Sarah Gillis and Anna Menon.  At 10:58 BST (05:58 ET), billionaire Jared Isaacman is set to become the first non-professional astronaut to step out into the vacuum of space  Jared Isaacman has exited the SpaceX Dragon craft and has become the first non-professional astronaut to undertake a spacewalk  SpaceX has confirmed that the four-hour window for the spacewalk will take place at 05:58 ET (10:58 BST)  Who is on the Polaris Dawn crew? Jared IsaacmanRole: Mission CommanderAge: 41Bio: Isaacman found the payment processing company Shift4 when he was 16. Scott ‘Kidd’ PoteetRole: Mission PilotAge: 50Bio: A retired Air Force commander with more than who has flown missions in Afghanistan, Bosnia, Kosovo, and Iraq. Sarah Gillis Role: Mission SpecialistAge: 30 Bio: As lead space operations engineer for SpaceX, Gillis oversaw Isaacman’s training for the Inspiration4 mission.Anna MenonRole: Mission Specialist and Medical OfficerAge: 38 Bio: Now lead space operations engineer for SpaceX, Menon was previously NASA’s biomedical flight controller for the ISS.  Today’s spacewalk had been pushed back from the original time of 07:23 BST (02:23 ET) although SpaceX did not state the reason for the delay. After half an hour, the pressure inside the Dragon fell below one psi allowing Jared Isaacman to tug on the hatch to break the initial friction. Isaacman then made his way out of the forward hatch of Dragon Resilience in the first ever commercial spacewalk. Initial confirmations from mission control suggested that the spacewalk was progressing well and Isaacman.Once outside the craft, Isaacman tested the mobility of the EVA suit as he stood on the Skywalker platform. After Isaacman returned to the cabin, mission specialist Sarah Gillman left her seat and exited the capsule herself.As she departed she informed mission control that some of the seals around the hatch were ‘bulging’ due to the pressure change.These changes were expected and Gillman was able to push these back into position before exiting.Once out, Gillman undertook the same set of movement tests and then returned to her seat. The hatch was then sealed and air was reintroduced to the cabin to bring the pressure back up to safe levels. The crew prepared the cabin for spacewalk by securing any loose items and donned their spacesuits. The spacewalk officially began when pure oxygen began to flow into the astronauts’ suits.  Having sealed their helmets, gasses from the ship pressurize the suits and allow the astronauts to breathe as the capsule vents its remaining air.All four members of the crew underwent suit checks, ensuring that the helmet’s heads-up display functions and that there were no air leaks. This is the first time that the SpaceX EVA suits have been used outside of laboratory conditions so the crew will be extremely careful to ensure that they are working well. With leak checks complete, the crew then waited for the cabin pressure to fall towards a level which matched the vacuum outside.  As oxygen begins to flow from the spacecraft to the suits the spacewalk had officially begun Having vented air from the capsule, mission commander Jared Isaacman prepared to open the Dragon’s hatch into space Unlike previous NASA spacewalks, the SpaceX suits will receive all their oxygen from the tether which you can see in the foreground of this image. This tether provided all the oxygen and pressure needed to keep the asteroids alive The Polaris Dawn crew are (from left to right) Anna Mennon, Scott Poteet, Jared Isaacman, and Sarah Gillis Yesterday, the SpaceX Dragon capsule carried the crew to an altitude higher than any human has been to since the Apollo missionsAs the pressure fell, the spacecraft made its way into the ‘EVA orientation’ with the trunk section pointing towards the sun to shield the astronauts. Mission commander Isaacman then carefully pulled himself out of the capsule and into open space.This Dragon spacecraft is the first to be fitted with a ‘Skywalker’ hatch which will help the astronauts pull themselves through the opening. Unlike the EVA suits used by NASA’s astronauts, the SpaceX suits only get their life support through an umbilical connecting to the ship rather than from a built-in system. This is the first time that the new SpaceX EVA suits have been used outside of laboratory conditions so much of the spacewalk will be spent testing the suit’s function and mobility  Footage from inside the Dragon capsule shows as the Polaris Dawn crew complete their final suit checks and await the go-ahead signal from mission control While this makes the suits far more mobile, it also means that the 12-foot (3.7m) umbilical will be the only thing preventing the spacewalkers from drifting off or asphyxiating. Mission pilot and former Air Force commander Scott Poteet and medical officer Anna Menon remained seated the entire time to monitor the vitals of the two spacewalkers. Since the Dragon spacecraft does not have an airlock, the entire craft needed to be depressurized at once so Poteet and Menon alos had to wear EVA suits during the spacewalk.  Despite having undertaken years of training for the mission, the Polaris Dawn crew (pictured) have no experience in space with the exception of Jared Isaacman (second from left) That exposed all four crew members to the harsh conditions of low orbit and broke the current record for most people simultaneously in the vacuum of space.Previously only state-backed space agencies have sent astronauts on spacewalks due to the extremely high risks involved.Floating beyond the protective walls of a spacecraft is considered to be one of the most dangerous tasks an astronaut can undertake.In this case, that risk was only heightened by the fact that none of the crew except for Isaacman have ever been in space before.  An hour after the spacewalk began, the hatch has now been closed and pressure has began to return to the Dragon capsule.  The Polaris Dawn mission made history when two crew members performed the world’s first civilian spacewalk, Jared Isaacman was the first to exit the spacecraft This needs to be done extremely slowly so that the huge changes in pressure do not cause any health complications for the astronauts onboard. Just like deep-sea divers, when astronauts enter the vacuum of space the sudden drop in pressure can cause dissolved nitrogen in the blood to expand into bubbles.These bubbles can cause a condition called decompression sickness, otherwise known as the Bends, which can be fatal in severe cases.To avoid decompression sickness the Polaris Dawn crew have spent the last two days going through a pre-breath procedure by breathing a high-oxygen gas mix to purge their blood of Nitrogen. This is significantly longer than the two hours normally taken by astronauts on the ISS before spacewalks as the cabin slowly decreased pressure and raised the level of oxygen.  The Polaris Dawn mission launched from the Kennedy Space Centre in Florida on September 10 at 5:23 am ET after days of delay due to weather and a helium leak. The Crew Dragon capsule does not have an airlock, which makes executing a spacewalk from this spacecraft riskierOn social media, commenters shared their excitement and well-wishes for the crew before the start of the spacewalk.One commenter wrote on X, formerly Twitter, ‘Let’s go!! Praying for a safe spacewalk for Polaris dawn.’Another commenter wrote: Absolutely breathtaking. Another achievement!”Humanity once again reaching out towards the stars’, another commenter said.SpaceX CEO Elon Musk, meanwhile, shared a simple excited statement, writing: ‘Spacewalk!!’ Some commenters also shared their amazement at the technological advancements behind this impressive feat.One commenter wrote on X: ‘History in the making on so many fronts.. let’s go. Godspeed and good luck to all the Astronauts!”Amazing technical accomplishment to get crystal clear video and audio back to earth. Much better than 50 years ago,’ another wrote.   On social media, commenters shared their support for the crew as they prepared for the spacewalk  Many commenters shared their excitement to see such a groundbreaking achievement  One excited commenter calls the mission ‘absolutely breathtaking’ The Polaris Dawn mission launched from the Kennedy Space Centre in Florida on September 10 at 5:23 am ET after days of delay due to weather and a helium leak.Yesterday, the SpaceX Dragon Crew spacecraft carried its crew to an altitude of 870 miles (1,400 km) above Earth – the highest any human has been since NASA’s Apollo missions. At that altitude, the Dragon capsule briefly entered Earth’s Van Allen Belt – a region where magnetic fields trap highly radiating charged particles.Entering the Van Allen Belt means the crew received a hefty dose of space radiation, getting as much in a few hours as they would in 20 years on the Earth by one estimate.   On X, many commenters shared their amazement, calling the mission ‘history in the making’ Some commenters expressed how impressed they were with the technological advancements behind the mission  SpaceX founder Elon Musk shared a simple message of excitement After reaching its highest point yesterday the Polaris Dawn crew celebrated by calling back to Earth from within the capsule. Here mission pilot Scott Poteet speaks to Earth via the spacecraft’s internal communication systemNASA has noted that it is crucial ‘to fly through this region quickly to limit exposure to radiation,’ since high doses of space radiation can increase astronauts’ long-term risk of cancer by damaging cellular DNA.By stepping out beyond the protection of the spacecraft, Isaacman and Gillan will once again expose themselves to harmful radiation, albeit in a far smaller dose.   While in space, the crew’s sole protection will be SpaceX’s new EVA suits.These suits have been designed using thermally resistant materials borrowed from the Dragon’s trunk section and includes a ‘Faraday’ layer which insulates the astronaut from any electrical fields.The new helmets also include a ‘heads-up display’ (HUD) and a camera which can stream video to Earth via the Dragon spacecraft.While in space, Polaris Dawn will also conduct nearly 40 scientific experiments some of which will measure the harmful effects of exposure to radiation. Mission Specialist and Medical Officer Anna Mennon  (pictured left) also took the time to read her children’s book ‘Kisses from Space’ to her family back on Earth (pictured right) The crew will also perform nearly 40 scientific experiments including a test of new smart contact lenses which will take biometric readings from the astronauts. Pictured: Sarah Gillis wears a smart contact lens in her left (page right) eye This mission uses the exact same Dragon spacecraft which Jared Isaacman (second from right) used on the Inspiration4 mission which brought the first all-civilian crew (pictured) into orbit These also include testing contact lenses embedded with microelectronics to continuously monitor changes in eye pressure and shape.The Polaris Dawn crew will also take the opportunity to trial SpaceX’s latest laser-based communication system nicknamed the ‘Plug and Play-ser’. They will attempt to communicate between the spaceship and Starlink – SpaceX’s more than 6,000-strong constellation of internet satellites, in a bid to boost space communication speeds.This mission also marks an important landmark for SpaceX’s goal of making the Dragon spacecraft the go-to option for orbital flights.The same Dragon used for this mission is the exact same craft used by Isaacman on the Inspiration4 mission and on NASA’s Crew 1 mission.  After six days in space, the mission will conclude with a splashdown off the coast of Florida.