Wormholes known as Schwarzschild wormholes are theoretical wormholes that are found in the center of a black hole and white hole and join two universes. They exist as exact solutions to Einstein's equations. Schwarzschild wormholes are extremely unstable, and would instantly fall apart once created. Some speculation exists that quasars are actually white holes instead of supermassive black holes.
Travel
It is impossible for a traveller to go through this type of wormhole because they can only go though a horizon in one direction. If the traveler is formed of non-exotic matter once they reach the center of the Schwarzschild wormhole then, they can't leave the other side, and they can't leave through where they came since the side they came in though was a black hole, meaning nothing can escape it once inside the Schwarzschild radius.
See Also
External Links
Very good site on Schwarzschild wormholes
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