ViciousKnids t1_j2drffz 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 and Issac Newton was the one to make a mental picture of the relationship of speed, trajectory, and gravity called "Newton's Cannonball." He hypothesized that there's basically a "sweet spot" in which an object traveling fast enough to not fall back to a surface but slow enough to not trail off into space. He hypothesized that gravity was a universal force and was the driver of planetary and satellite motion.
It's a pretty famous though experiment. It's even referenced in Issac Newton's episode of Epic Rap Battles of history.
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