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We went to a planetarium last night last night and watched "Black Holes" narrated by Liam Neeson. If I recall correctly, he said that scientists believe that they have identified a number of Black Holes, and that they think there are White Holes at the bottom of Black Holes and instead of drawing matter/light in, the White Holes spew matter out. I didn't get to ask this question after the session was over: Have scientists been able to find an example of a possible White Hole?

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The Big Bang is pretty much it. –  Andrew Feb 29 '12 at 23:34
@Andrew: No, the Big Bang was not a white hole. One way to see this is that an FLRW spacetime is homogeneous, whereas a Schwarzschild spacetime has only rotational symmetry. –  Ben Crowell Jul 12 '13 at 18:20

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It's only a fictional object that agrees with einstein's formulas. But there is no evidence that that objects exists or had existed.

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White hole is possible under General Relativity but violates the second law of thermodynamics. It is thus impossible.

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Any reference for that violation? –  TMS Dec 4 '12 at 13:35
@TMS White hole is a black hole, reversed in time. –  Anixx Dec 4 '12 at 14:47
Sorry but that doesn't make the answer on violation obvious for me. –  TMS Dec 4 '12 at 17:03
What may be easier to convince oneself of is that it can't form by gravitational collapse (since nothing can fall in). –  Ben Crowell Jul 12 '13 at 18:21

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