Two recently observed black hole mergers, occurring just weeks apart in late 2024, have opened an extraordinary new window ...

Two Caltech historians associated with the Einstein Papers Project have gathered together what they consider to be the most important of Einstein's ...

Centuries before anyone pointed a telescope at the sky, Isaac Newton figured out how gravity works. He showed that any object ...

The model questions the popular inflation theory, which most experts believe was facilitated after the universe's birth. The ...

A century ago, Albert Einstein became famous. Sure, he was already well-known among physicists. But the world at large learned his name only after November 1919, when news broke that his theory of ...

Researchers have unveiled a new model for the universe’s birth that replaces cosmic inflation with gravitational waves as the ...

For the first time, scientists have detected two black hole mergers with spins so unusual they may reveal a new generation of ...

Time is not absolute, and Einstein argued that different observers experience the present differently depending on relativity ...

Astronomers have detected two extraordinary gravitational wave events that may have come from black holes formed in earlier ...

In October 2015, a young mathematician named Clemens Sämann was flying home to Austria from a conference in Turin, Italy, when he had a chance encounter. He found himself seated beside Michael ...

New strategies may soon allow scientists to test dark energy theories within our own solar system, linking cosmic-scale physics to local observation. Science advances through a cycle of proposing ...