Ripples in space-time from a pair of merging black holes have been recorded in unprecedented detail, enabling physicists to test predictions of general relativity ...

This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of ...

For those who watch gravitational waves roll in from the universe, GW250114 is a big one. It's the clearest gravitational ...

"It highlights gravity's possible hidden complexity and invites a reevaluation of where dark matter effects originate." ...

Time feels like the most basic feature of reality. Seconds tick, days pass and everything from planetary motion to human memory seems to unfold along a single, irreversible direction. We are born and ...

In 1905, Albert Einstein revolutionized physics by demonstrating that time is not absolute but relative to the observer's ...

Quantum mechanics has always carried a quiet tension. At its core, the theory allows particles to exist in many states at ...

The sharpest black hole collision ever detected just gave Einstein another win—and raised hopes that the next one might ...

Scientists have uncovered incredible truths about the universe, yet some mysteries still refuse to show us an explanation.

Can Mars let humans age faster? It sounds more poetic than reality, but it may be true technically. Two identical clocks: One on Earth other on Mars, .

A newly detected gravitational wave, GW250114, is giving scientists their clearest look yet at a black hole collision—and a powerful way to test Einstein’s theory of gravity. Its clarity allowed ...