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:: Black holes on the other-hand have been identified. We know there locations as we know the locations of other stellar phenomenon. They have properties and attributes. They can be falsified if it is shown that what we accept as black holes are shown to be other phenomenon. Or the theory can be falsified if black hole are shown to have distinctly different qualities then what was theorized. --[[User:BMcP|BMcP]] 16:25, 14 December 2009 (EST)
:: Black holes on the other-hand have been identified. We know there locations as we know the locations of other stellar phenomenon. They have properties and attributes. They can be falsified if it is shown that what we accept as black holes are shown to be other phenomenon. Or the theory can be falsified if black hole are shown to have distinctly different qualities then what was theorized. --[[User:BMcP|BMcP]] 16:25, 14 December 2009 (EST)
:: A few points. Firstly, the sentence "it is impossible to prove that no black hole exists anywhere" only makes sense 1) if you know for certain that no black holes exist or 2) it is impossible to search everywhere and you don't happen to find one in the limited places you look. Secondly, I am having trouble with the very strict definition of falsifiability. It does not seem to allow for the existence of human beings as a scientific theory i.e. I can not think of a way to show that humans do not exist. Thankfully in this part of the discussion page falsifiability is allowed a slightly more reasonable definition. On the subject of black holes, no black holes have ever been seen. They have been inferred. The inference stems from observing the gravitational affect on nearby matter such as stars. One example is of stars in the center of the Milky Way but there are others. Using simple Newtonian gravity (and Kepler's Laws), the mass of the object they are orbiting can be calculated as can the size of the volume it occupies. The implied density of matter fits with the concept of a black hole. So they "look" like black holes gravitationally. Of course, they still might not be. People need to put the effort into finding ways to falsify General Relativity and suggest alternative explanations that fit the data. Many scientific groups are trying to falsify General Relativity by measuring extreme gravitational environments such as massive binary objects. --[[User:Stuart|Stu]] 10:24 (EDT)
== Concerning escape velocity of black holes ==
== Concerning escape velocity of black holes ==