Some things we see in space appear to outpace light. Now we are learning to harness these bizarre optical illusions to ...

The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...

Astronomers have observed a supermassive black hole far from the center of a galaxy where it ought to be giving off bright ...