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In astrophysics, a gravastar is an object hypothesized in a 2001 paper by Pawel O. Mazur and Emil Mottola as an alternative to the black hole theory. It has the usual black hole metric outside of the horizon, but de Sitter metric inside. On the horizon there is a thin shell of exotic matter. This solution to the Einstein equations is stable and has no singularities. Further theoretical considerations of gravastars include the notion of a nestar. Read more
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