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Using mathematics we can show that light cannot escape a black hole.

We can also show that ordinary matter can never approach the speed of light.

The key here is gravity.

If the mass increases then in theory so should its gravity.

There is no difference between length contraction due to velocity and due to that under gravitational as they are both uni-directional and involve momentum.

Quote from: jeffreyHUsing mathematics we can show that light cannot escape a black hole.Math can’t show anything whatsoever. Using mathematics we can show that general relativity predicts that light cannot escape a black holeQuote from: jeffreyHWe can also show that ordinary matter can never approach the speed of light.Any and all matter can approach the speed of light. In fact it came come as close to it as we’d like it to.Quote from: jeffreyHThe key here is gravity.Not at all.Quote from: jeffreyHIf the mass increases then in theory so should its gravity.If that’s all that’s present then that’s true. However there are other sources of gravity which when present and significant enough can also help to increase gravity or act to decrease it.Quote from: jeffreyHThere is no difference between length contraction due to velocity and due to that under gravitational as they are both uni-directional and involve momentum.They’re very different in fact.

"Addendum. Also consider a mass that had reached light speed"Why? Nothing can reach light speed."This also re-raises the question should it be easier to accelerate a black hole to light speed than any other form of matter?"No, it's impossible with a black hole or an electron or whatever."There is no difference between length contraction due to velocity and due to that under gravitational "Still wrong.I can measure the contraction of a meter rule under gravity, here on earth.But I can't, within my own frame of reference, measure the contraction due to special relativity.