Along with the first private-sector spacewalk, the SpaceX Polaris Dawn crew also will set a new Earth-orbit altitude record.
Jared Isaacman, a billionaire adventurer and philanthropist who chartered the first commercial flight to orbit aboard a SpaceX Crew Dragon in 2021 plans to blast off with three crewmates on an even more daring flight Tuesday, this one featuring the first commercial spacewalks.
But researchers say Isaacman's crew will receive roughly the same radiation dosage during their five days in space as a space station crew gets during less than half of a normal six-month stay in orbit.In any case, the Crew Dragon will only spend about 10 hours in that extremely elliptical orbit. After that, the ship's thrusters will fire again to lower the apogee to 435 miles.
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