Despite more than a century of efforts to show otherwise, it seems Albert Einstein can still do no wrong. Or at least that’s the case for his special theory of relativity, which predicts that time ...

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.

Time dilation, brought about by the relativistic expansion of space, has resulted in the observed slowing of 'clocks' in the early universe. When you purchase through links on our site, we may earn an ...