Tim Urban
@waitbutwhy · Dec 28, 2019
If you were floating in space and lit a flashlight and pointed it ahead of you, the expulsion of photons would push you backwards very very slowly like the lamest rocket engine in history. youtube.com/watch?v=v3y8AI… @Kurz_Gesagt
Elon Musk
@elonmusk
Maximizing conversion of mass to aimed photons (pure momentum) is actually the highest possible efficiency, which is why an antimatter drive is probably the best way to get to other star systems with known physics. For “close” stars, a laser sail is good too.
07:46 PM · December 28, 2019 · 0 views
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