2/ space is curved by mass curvature influences the escape velocity space is so steeply curved inside the event horizon of a black hole that the escape velocity > chttps://twitter.com/BuucketHe4d/status/1316356037407117313 …
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3/ when something launches vertically in a gravity field, it is decelerated shoot a gun straight up, and the bullet loses velocity / kinetic energy continuously when photons travel up in a gravity field, they lose energy and their wavelength drops, i.e. they're red shifted
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If they didn't have made, a solar sail wouldn't work
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Photons have momentum but not mass, this has been proven experimentally.
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Good thread.
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Hmm, I never thought about that
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