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The Polaris Dawn mission is the first of three flights Jared Isaacman bought from SpaceX in 2022 for his human spaceflight effort known as the Polaris Program.
It makes sense that the astronauts would need time to adapt to the pressure difference, but…
Surely they’ve been tested on earth before launch???
Yes, but the microgravity plus radiation environment makes for a fundamentally different thing than testing in a lab!