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 new software package detailed by Chinese scientists promises to tell what time it is on the moon, accounting for effects of relativity. When you purchase through links on our site, we may earn an ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

According to Einstein's theory of relativity and a new NIST study, time on Mars passes faster than on Earth. Discover the implications for future space travel.

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

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 ...

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 ...

The way time ticks forward in our universe has long stumped physicists. Now, a new set of tools from entangled atoms to black ...

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