Answer 1:
Since we've never seen a white hole or anything
that could be interpreted as such, we can't be
sure if they exist at all, let alone how they
form.
Einstein's theory of general relativity
predicts that spinning black holes will have
ring-shaped singularities as opposed to point
singularities. However, the very concept of a
singularity violates Heisenberg's uncertainty
principle from quantum mechanics. Unlike with
white holes, we are fairly certain that black
holes do exist, since there are a number of
objects that we have detected for which black
holes are by far the most plausible explanation.
Without being able to see what is inside of the
event horizon, though, we really don't have any
idea of what takes place inside. To the best of my
knowledge, most physicists believe that gravity
has a quantum description that we haven't yet
elucidated. If so, then Einstein is wrong in that
real black holes don't contain singularities of
any type.
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Answer 2:
I'll just send you this from Wikipedia, because
white holes are new to me:
white holes.
In general relativity, a white hole is a
hypothetical region of spacetime which cannot be
entered from the outside, although matter and
light can escape from it. In this sense, it is the
reverse of a black hole, which can only be entered
from the outside and from which matter and light
cannot escape.
If white holes are Hypothetical, I'm not sure how
much one can say about them, but the Wikipedia
link will will tell you more.
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