Can we use the momentum of light to propagate spacecrafts in space?

  • #1
as we know light has momentum so theoretically we can use it but is it practical?
(also this is it that light only exerts force if incident on something?)
 

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  • #2
berkeman
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https://en.wikipedia.org/wiki/Solar_sail

220px-Solarsail_msfc.jpg
 

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  • #3
anorlunda
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