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Fuck shorts.
Tl;dw: because the universe has a beginning (not infinitely old) so the light of some stars hasn’t reached us yet; also, because some stars have already died; and finally, because of the expansion of the universe (light gets red-shifted.)
https://www.youtube.com/watch?v=i8wAjC69ZuY
I know people love to man in the middle YouTube, but it does break applications that find YouTube links and replace them with our preferred application