By seeing their gravity pulling on other things ... There are more fundamental questions, too, ranging from ‘What’s inside a black hole?’ to ‘How are supermassive black holes tied to their galaxies?’ ...

"The singularity is the most mysterious and problematic part of a black hole. It's where our concepts of space and time ...

Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity. And anything that ...