Quote:
Originally Posted by PaulAstroNOOB
... 1) we dont know whether Electromagnetic radiation behaves the same around other, much different celestial bodies (eg does the speed of light in space change in proximity of a black hole) ...
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We're working on the assumption that we DO know how electromagnetic radiation behaves in all but the rarest and most extreme circumstances, and so far it all presents us with a very consistent model that has successfully predicted many previously unseen phenomena.
Is this proof? No there will never be proof.