Before I read your question, I had never heard of a white hole. So, I scampered over to my friend Vivienne Baldassare to find out more. She’s an astrophysicist at Washington State University. She told ...

Black holes live forever, at least according to general relativity. Once material crosses a black hole's event horizon, it is trapped forever, until the last day of cosmic time. But we know that isn't ...

White holes, the theoretical opposites of black holes, exist only in mathematical equations—at least for now. They emerge naturally from Einstein’s general relativity, yet defy physical intuition by ...

There are black holes that are too big to be born from the death of a star but aren’t quite supermassive either. There’s ...