Physicists have started to treat a once-fringe idea with surprising seriousness: that our entire observable universe might be the interior of a black hole that formed in some larger cosmos. The notion ...

Black holes like the one shown in this illustration can grow astonishingly massive by feeding on immense amounts of matter. But just how big can they get? In the early 1960s astronomers discovered a ...

If you have been worried about the two large 'holes' opening up on the Sun and pointing straight at Earth, you are not alone. Social media posts have said that these enormous gaps in the Sun's ...