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The billionaire CEO who made history with SpaceX describes facing the 'vacuum of death' in only a spacesuit

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Shift4 CEO Jared Isaacman made history two months ago when he opened up the hatch on a SpaceX rocketship and stepped into outer space.

"There's nothing that's separating you from the vacuum of death other than the single-pane visor," Isaacman said.

The Polaris Dawn crew carried out around 38 science and research experiments to test the impact of radiation on the human body.

Isaacman sees a future where humans walk on Mars .

He anticipates fully reusable Starships becoming a reality within the next decade .

The challenges don't end with the formation of an off-world base, he said.

Roughly half the people who go to space get sick, Isaacman said.