Neil deGrasse Tyson
@neiltyson · 14 oct. 2019
Christopher Columbus took three months to cross the Atlantic in 1492.
The International @Space_Station takes 15 minutes.
Elon Musk
@elonmusk
Most people aren’t aware that orbit (and “zero” gravity) is all about horizontal speed, not altitude. A spacecraft needs to travel about 25 times the speed of sound to stay in space.
20:41 · 14 octobre 2019 · 0 vues
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