We have observed things in our universe which match our expectations of black holes: http://en.wikipedia.org/wiki/Black_hole#Observational_evidence http://en.wi

We have observed things in our universe which match our expectations of black holes: http://en.wikipedia.org/wiki/Black_hole#Observational_evidence http://en.wikipedia.org/wiki/Black_hole#Observational_eviden... That we have observed something is not in dispute, as I understand it. What's in dispute is what, exactly, these things are.