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A comment on LightSail 2 Spacecraft Successfully Demonstrates Flight by Light. Parent comment

Re:LightSail 2 Spacecraft Successfully Demonstrates Flight b... by umvi on Wednesday July 31, 2019 @06:23PM (#20579192)
No, the two forces don't cancel out, I can't remember exactly why but elastic collisions don't work like that. That's why you can point a fan into your sailboat's sail and it will still go forward, mythbusters proved it.
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Re:LightSail 2 Spacecraft Successfully Demonstrates Flight b... by mkl on Thursday August 01, 2019 @07:48AM (#20582955)
Mythbusters demonstrated something different, and something much less efficient than simply pointing the fan backwards like a normal fan boat (no sail required). Here: https://mythresults.com/blow-your-own-sail
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