Space and time looked settled, at least in broad outline. Einstein’s special relativity gave physics a durable framework for describing motion, and for more than a century one boundary seemed firm: ...

Faster-than-light particles have spent decades in physics as both temptation and warning. They offered a way to test the ...

For those who watch gravitational waves roll in from the universe, GW250114 is a big one. It's the clearest gravitational wave signal from a binary black hole merger to date, and it gives researchers ...