if photons had mass, then they would have a infinite kinetic energy https://en.wikipedia.org/wiki/Kinetic_energy#Relativistic_kinetic_energy_of_rigid_bodies …https://twitter.com/BuucketHe4d/status/1316355577518452736 …
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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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It's a super simplified visual representation of how gravity kind of works but it makes sense. https://www.youtube.com/watch?v=MTY1Kje0yLg&ab_channel=apbiolghs …
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