Don't say because they are both mass-less cause I know.
There has to be some "connection"? Just a cosmic coincidence?
There has to be some "connection"? Just a cosmic coincidence?
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It is more of an assumption that they do, for lack of better information.
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http://www.desy.de/user/projects/Physics/Relativity/GR/grav_speed.html
hope this helps.
hope this helps.