The Difference Between Black & White Holes:

People like to think of black holes and white holes as gateways through the universe. it would be rather convenient if we could enter a black hole, zip across the universe, and come out at some distant point in space (and maybe even time). Sure, figuring out the exact mechanics would be tricky, but once we had the pattern down, it would make interstellar travel, and probably intergalactic travel, a breeze. However, this view of white holes isn"t exactly accurate.

To learn what white holes really are, see:
http://www.fromquarkstoquasars.com/what-is-the-difference-between-a-black-hole-and-a-white-hole/