Time moves differently in space. Near black holes, gravity slows clocks and stretches seconds. This explainer reveals how time bends and affects astronauts and Earth.

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 ...

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

The mystery of dark matter—unseen, pervasive, and essential in standard cosmology—has loomed over physics for decades. In new ...

For Leslie Lautenslager, it started as an interest in protocol and diplomacy ultimately landing her as a first-time author recalling her years as Colin Powell’s assistant. “I don’t think of myself as ...

Cosmic radio pulses repeating every few minutes or hours, known as long-period transients, have puzzled astronomers since ...

Will two rare supernovas finally tell us how fast the universe is expanding? Perhaps, but we'll have to wait for it for them ...

TAMPA, Fla. — Tampa General Hospital was recently ranked No. 1 in the nation for performing more organ transplants than any other hospital. For every surgery that adds up to set a record, there is a ...

Even after the German armies capitulated in World War II, a fanatic Wehrmacht general, commanding a force of last-ditch Nazis, held out against the Russians in a Bohemian mountain redoubt. Field ...