Quote:
Originally Posted by Tadao
Black holes freak me out. The kind of freak out like when you think about how rare it is for you to be born at all.
I think about the rubber sheet thing and how gravity bends light, so how does a black hole fit into that.
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Considering the escape velocity might be helpful - for a black hole, it is greater than the speed of light.
As far as the rubber sheet goes, black holes can be inferred by how far light is bent by intervening galaxies, a phenomenon called gravitational lensing. It's how we can estimate the masses of galaxies, and hence infer the presence of black holes, and other forms of dark matter.
I hope this is helpful.