TIL about the Bussard Ramjet, a theoretical method of spacecraft propulsion for interstellar travel. A spacecraft scoops up hydrogen from the interstellar medium, the hydrogen is compressed until thermonuclear fusion occurs, and the fusion provides thrust for the spacecraft.

https://en.wikipedia.org/wiki/Bussard_ramjet
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https://www.reddit.com/r/todayilearned/comments/1fzwn0e/til_about_the_bussard_ramjet_a_theoretical_method/