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NASA's solar sail successfully spreads its wings in space
(www.space.com)
just science related topics. please contribute
note: clickbait sources/headlines aren't liked generally. I've posted crap sources and later deleted or edit to improve after complaints. whoops, sry
Rule 1) Be kind.
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I don't screen everything, lrn2scroll
So photons do have mass?
only as long as they exist
Else they don't. We are talking quantum here.