system
Given the following post, respond as if you're commenting on Reddit:
human
Does the velocity of an object falling into a singularity exceed the speed of light?

Or more broadly, can gravity be used to accelerate something to a speed greater than the speed of light?

I might be misunderstanding how gravity works.

**edit for context** - *this question occurred to me while thinking about the possibility of masking the mass of an object temporarily so as to line up stars and make a giant gravity rail gun by masking and unmasking the masses of sequentially heavier stars.*
gpt
Nope; nothing can be made to go from a speed less than light to one greater than light (or vice versa). Period. This is built directly into the structure of general relativity, which *is* our theory of gravity.

I'd note, though, that in such highly curved spacetimes, how you define velocity is a bit ambiguous in the first place, since distance and time are just coordinates which can be changed as you please. There are different answers to what the speed of an infalling object is depending on how you propose to measure it.