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.

A photon emitted from a star a billion light-years away arrives at a telescope having experienced no time whatsoever. Not ...

Add Yahoo as a preferred source to see more of our stories on Google. GPS satellites must account for and correct for time dilation For centuries, humans have thought of time as a linear concept - but ...

NPL has shared the results of a time dilation demonstration—which shows that time travels faster as height increases, as predicted by Albert Einstein's theory of general relativity. The demonstration ...

In 1916, only a year after Albert Einstein had published his general theory of relativity, Karl Schwarzschild used ...

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 ...

Time dilation is usually present in sci-fi movies especially if the main theme is all about cosmic encounters. While it sounds impossible in real life, astronomers said that it had happened in the ...