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Gravastars and the matrioshka universe.
“An expanding mini-universe could counterbalance the collapsing matter of a star, thereby creating a stable gravastar. Credit: Daniel Jampol...
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Can black holes be the key to dark energy? When we think that the black hole absorbs energy fields and matter inside it. That means the ene... -
“Timing delays in quasar light bent by massive galaxies offer a fresh way to measure the universe’s expansion, and the results deepen the ri... -
“A 1977 theory known as quadratic gravity was long left to languish because of its negative-energy “ghost” particle. But the ghost might not...
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