A new solution to Albert Einstein's theory of general relativity suggests hypothetical gravitational stars that look like black holes could be nested within one another.

E. Giorgi, S. Klainerman and J. Szeftel Wave equations estimates and the nonlinear stability of slowly rotating Kerr black holes. arXiv. Posted May 31, 2022. doi: 10.48550/arXiv.2205.14808.

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