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Originally posted by quiksilver
wait, so if you were in a space where there were no glaxies and stuff and you were watching all these galaxies zoom around(lets say theres no speed limit to light to view them) they are travelling at about 50% speed of light some of them, wuldn't they gain all this extra mass? - so that nothing we measure is the true mass, or does the frame of reference also effect the increase in mass due to speed?.
Originally posted by amantine
This also solves one of the questions most people have: if you accelerate a particle enough, does it become a black hole? It doesn't, become the gravity depends on the Einstein tensor Gab = 8*pi*Tab, and Tab is the stress-energy tensor, which only uses the rest mass, not the relativistic mass.