We could be living inside a black hole. This head-spinning idea is one cosmologist's conclusion based on a modification of Einstein's equations of general relativity that changes our picture of what happens at the core of a black hole.

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"I think this guy's idea is wrong. Tamara Davis's 2004 PhD gives the correct picture in my opinion. Our observable universe is sandwiched between our past and our future horizons." -- Jack Sarfatti