As per Einstein, time is not universal but relative. The faster you travel, the more slowly time moves for you.

Tracking time is one of those things that seems easy, until you really start to get into the details of what time actually is. We define a second as 9,192,631,770 oscillations of a cesium atom.

Tiny “Ferris wheels” made from light and extremely cold particles could allow researchers to test a facet of Albert Einstein’s theory of relativity on unprecedentedly small scales. Theories of special ...

When Ryland Grace reaches Tau Ceti in Project Hail Mary, about four years have passed for his human body and fragile psyche. But, because of the effects of time dilation, about 12 to 14 years have ...