Every black hole may hold a hidden universeDeep inside a black hole? (Image: Serge Brunier/Clemson/NASA) 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. In an analysis of the motion of particles entering a black hole, published in March, Nikodem Poplawski
