This means no information can escape from within a black hole, so we can never directly observe or measure what lies at its heart. Using the mathematics of Einstein's 1915 theory of gravity ...

The big question is whether scientists could ever find evidence for this theory from actual observations of black holes; after all, we know we can't simply peer into their interiors.

A groundbreaking new study proposes that black holes, which absorb everything into an inescapable void, may eventually transition into “white holes” that eject matter and energy into the cosmos.