NASA is training astronauts for space in an underwater station—and you can watch them live

Given that Earth has gravity, it’s difficult for astronauts to learn what it will be like once they’re floating around in the endless expanse of space, in which there is essentially no gravity. The ocean is the next best thing. Not only because moving through water is somewhat similar to weightlessness, but also because it provides an extreme, isolated environment akin to outer space.

Since 2001, NASA has trained astronauts at Aquarius, an underwater research base a few miles off the...

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