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Black holes are still as mysterious as they were 100 years ago. "The nestar is like a matryoshka doll", says German physicist

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Goethe University Frankfurt physicists Daniel Jampolski and Luciano Rezzolla have come up with a new solution to Einstein 's field equations that describe black holes.

They say it's possible for a gravatar with a slightly thicker membrane to balance a second gravatar within.

A second nested gravatar could be pregnant with its own exotic shell of highly compressed matter, forming a nestar.