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You must be knowing about blackholes but let us know something about Whiteholes.
A white hole , in general relativity, is a
hypothetical region of spacetime which cannot be entered from the outside, but
from which matter and light have the ability to escape. In this sense it is the
reverse of a blackhole , which can be entered from the outside, but from which
nothing, including light, has the ability to escape.
Like black holes, white holes have
properties like mass , charge , and angular momentum . They attract matter like
any other mass,but objects falling towards a white hole would never actually
reach the white hole's event horizon the white hole event horizon in the past
becomes a black hole event horizon in the future, so any object falling towards
it will eventually reach the black hole horizon..