What are white holes and how do they differ from black holes?

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what r white holes
 
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White holes are the opposite of black holes...or maybe they are the same:

see

http://en.wikipedia.org/wiki/White_Holes

If anything survives getting sucked into a black hole it might be ejected at a distant white hole end and into another universe...
 
White holes are basically theoretical anti-black holes- meaning, they are a time reversal of the black hole and eject any matter that has crossed into the event horizon.

The reason we really don't know a lot about them is that they are purely theoretical- they only arise as a solution to one of Einstein's equations, and can only exist under ideal conditions.
 

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