Watch SpaceX's Polaris Dawn mission conduct the first all

SpaceX's Polaris Dawn mission finally launched on 关键字3Tuesday, after a series of delays pushed back its commencement date. Now the crew of the private spaceflight are scheduled to take the first ever commercial spacewalk — and the entire thing will be livestreamed so we can watch it here from Earth.

Launched via a Falcon 9 rocket on Sept. 10, the Crew Dragon Resiliencereached its highest point of around 1,400km (870 miles) above Earth on the second day of its five-day mission. Today's spacewalk will take place a little closer to home though, with crewmembers scheduled to attempt the world's first all-civilian spacewalk on day three at approximately 700km (435 miles) up.

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How to watch SpaceX's Polaris Dawn spacewalk

If all goes to plan, two members of Polaris Dawn's all-civilian crew will attempt the first commercial spacewalk on Thursday, Sept. 12 at 5:58 a.m. EDT / 2:58 a.m. PDT. The livestream will begin approximately one hour prior to this at 4:55 a.m. EDT / 1:55 a.m. PDT.

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You'll be able to watch the spacewalk on the SpaceX website, SpaceX's X account, and on the recently launched X TV app if you actually installed it. Space.com will also host a livestream on YouTube (embedded below).

If all doesn't go to plan and today's spacewalk is cancelled, Polaris Dawn's crew will try again tomorrow.

What are the objectives of Polaris Dawn's spacewalk?

Credit: SpaceX

Though the thrill of being in space is undoubtedly enough for Polaris Dawn's crew, today's spacewalk does have a purpose. Polaris Dawn's spacewalk will be the first outing of SpaceX's Extravehicular Activity (EVA) suit, with the civilian crew putting it to the test. 

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Unveiled this May, the EVA suits build on the Intravehicular Activity (IVA) suits previously worn by those aboard Crew Dragon spaceflights. The EVA's 3D-printed helmet includes an updated visor designed to reduce glare, as well as a new heads-up display and camera. This can show wearers information on their suit's pressure, temperature, and relative humidity.

"Developed with mobility in mind, SpaceX teams incorporated new materials, fabrication processes, and novel joint designs to provide greater flexibility to astronauts in pressurized scenarios while retaining comfort for unpressurized scenarios," SpaceX wrote in May. "The suit also incorporates enhancements for reliability and redundancy during a spacewalk, adding seals and pressure valves to help ensure the suit remains pressurized and the crew remains safe."

The EVA's design is also intended to be scalable in order to allow people of different sizes and body types to venture into space. According to SpaceX, this is a step toward creating thousands of spacesuits to establish "a base on the Moon and a city on Mars."

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Today's civilian spacewalk is just one of several mission objectives for Polaris Dawn. Yesterday the Resilience's 1,400km apogee achieved Polaris Dawn's goal of reaching the highest Earth orbit since the National Aeronautics and Space Administration (NASA)'s Apollo program. Polaris Dawn's crew also intends to conduct 36 studies and experiments, researching human health as well as testing Starlink's laser-based communications in space. 

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Who is on Polaris Dawn's spacewalk?

The crew of SpaceX's Polaris Dawn mission. From left to right: Mission Commander Jared Isaacman, Mission Pilot Scott "Kidd" Poteet, Mission Specialist Sarah Gillis, and Mission Specialist and Medical Officer Anna Menon. Credit: SpaceX

Polaris Dawn has a crew of four, led by Mission Commander Jared Isaacman. The billionaire CEO of payment processing company Shift4, Isaacman was previously commander of SpaceX's Inspiration4 mission, the world's first all-civilian spaceflight.

Accompanying Isaacman is Mission Pilot and retired U.S. Air Force member Scott "Kidd" Poteet. SpaceX employees Sarah Gillis and Anna Menon are also on board as Mission Specialists, with the latter also serving as the mission's Medical Officer. Both Gillis and Menon are Lead Space Operations Engineers at SpaceX.

Not all of the Resilence's crew will exit the spacecraft during the spacewalk. Isaacman and Gillis are currently the only people scheduled to emerge from the Crew Dragon today, doing so one after the other rather than simultaneously. However, all four crew members will still don SpaceX's EVA suits and be exposed to the vacuum of space. This is because the Crew Dragon lacks an airlock, so opening it up to let Isaacman and Gillis out will require the entire spacecraft to be depressurised.

The spacewalk is scheduled to last for two hours, from the initial venting of the Resilienceto its repressurisation. Isaacman and Gillis' actual external spacewalk is expected to last around 20 minutes per person.