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cavalier78 t1_j2dhb8v wrote

Reply to comment by Full_Temperature_920 in eli5: back then, before astronouts goes to space, how do we know about thing like nonexistent of oxygen & zero gravity? by zetasstra

Yes. But everything is also moving fast perpendicular to the falling direction. Like it’s falling down, but it’s also going thataway so fast that it always misses the Earth. And there’s no air in space to slow you down, so you just keep going thataway and keep missing the Earth.

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