1. What are white holes?

  2. How do they affect spacetime?

  3. A black hole has extreme gravity which bends the spacetime fabric, but what does a white hole do?

  4. Also, what are they made of?

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    $\begingroup$ See Can humans make white holes. I won't flag this as a duplicate, but my answer effectively answers this question as well. $\endgroup$ – John Rennie Oct 23 '15 at 6:08
  • $\begingroup$ Also somewhat related to While hole formation and queries (among others in the "Related" section). Also, have you even bothered to do an internet search of white hole? I only ask because all of your questions are answered in the Wikipedia entry that Qmechanic inserted. $\endgroup$ – Kyle Kanos Oct 23 '15 at 12:13

White holes are purely theoretical 'exit black holes' where matter sucked into black holes escape through white holes. They have not been observed in our universe and do not currently belong to mainstream physics. Thanks for the question though, and I hope I helped you a bit with it.

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    $\begingroup$ Did you mean "hypothetical" not "theoretical". $\endgroup$ – RedGrittyBrick Oct 23 '15 at 10:27
  • $\begingroup$ Thanks, but a doubt. Do white holes also have extreme gravity? Does the singularity of the black hole explode when it becomes a white hole? $\endgroup$ – user3724492 Oct 24 '15 at 7:11

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