Is it physically possible for an object to achieve the speed of light if it is in a gravitational field strong enough and the mass does not collide before it attains a velocity of $c$? It is true that the mass of the object approaches infinity as its speed approaches $c$, but maybe there could be an (almost) infinitely powerful gravitational field (increasing in strength as the mass speeds up) originating from a very long distance away, which could accelerate the mass to this impossible speed? I ask this because it appears that you would not need an infinite amount of fuel for taking the object to the speed of light.


marked as duplicate by John Rennie gravity Nov 26 '17 at 11:39

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