What is Grey Hole?
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A grey hole is an object from which matter and radiation escape, rise to a certain distance above the event horizon, and then fall back in. Compare to a
In the case of White Holes, Black Holes, and of Grey Holes, they all have two singularities, one in the past and one in the future.
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Fear of not receiving a letter from Hogwarts School of Witchcraft and Wizardry on one's eleventh birthday.
A study recently showed..