The flare came from a supermassive black hole that’s 10 billion light years away, making the flash the most distant one observed so far. It hails from a time when the universe was rather young. A ...

How do we know the speed of light – and why does it have a speed limit at all? Leah Crane explores the history of one of the ...

Explore the science and mystery of time travel — from Einstein’s relativity and paradoxes to wormholes and real-life claims.