Will a human-powered light sail be launched into space before 2040?
Mini
4
Ṁ1012040
48%
chance
1D
1W
1M
ALL
https://en.wikipedia.org/wiki/Solar_sail#Interstellar_flight
Must be powered by laser, maser, or other human source of light; not the sun. It must actually be a space vehicle, not a contained experiment.
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