Elon Musk
@elonmusk · Jan 26, 2015
Reason is Newton's Third Law. In vacuum, there is nothing to "push" against. You must react against ejected mass.
Elon Musk
@elonmusk
And pls don't ask me about space elevators until someone at least builds a carbon nanotube structure longer than a footbridge
03:45 AM · January 26, 2015 · 0 views
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