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JamesJM
good chance we're missing each other here... general relatively is so easy to discuss, no?
As for your example, yes, the light would be traveling at the same rate no matter how fast you were traveling.. and that same beam of light measured from anyplace - - this is when that little booger "time" comes into play. I think that's firmly established.
If you want a real mind-bender there is this: currently it is believed that 'light' itself is both a wave AND a particle. (they may have 'proved' that? I'm not sure).
Or this one that I read some time ago.
If you shine a single proton of light from a source onto a sheet of "anything" that has two slits, rectangles, or circles for that matter, and a viewer is standing on the other side of the sheet which path does the proton travel to get to the viewer? Through which slit?
Answer: According to what I read: Both, simultaneously... as well as every other other path possible, an infinite number of path's, to include every possible path in the universe... meaning through two slits on a sheet being held on an obscure planet existing at the edge of the universe billions of light years from the sheet being used in the experiment.... and yet NOT break the speed of light barrier.
When I think of things like that... I hit the whiskey pretty hard. - JamesJM