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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A plastic chip of a certain thickness that is used to jimmy open locked doors. Bus passes are too thin, but an old expired credit card i..
