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Keatah last won the day on May 15 2018
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A photon travels at the speed of light and experiences zero-time. Therefore it does not decay, because “decay” is something that happens over time. And all photons have seen both the beginning and the end of The Universe simultaneously.
xucaen
When I photon hits a brick wall, what happens to it? When a photon hits a black hole, what happens to it?
atari2600land
So how do we know photons even exist?
And how is there an end to the universe?