The mind-bending concept of time dilation results from a seemingly harmless assumption—that the speed of light is the same for all observers.

Waking up early is always hard for everyone. This relative element of time waits for no one. Time, as stated by Einstein himself, is said to be relative. In fact, it is kind of philosophically ...

Einstein's theory of special relativity teaches us that time is relative. But what does it mean for time to be relative? How can we live in a universe where nobody can agree on when events start ...

While time is relative, it still flows in one direction for every observer. We don’t yet understand why, but some physicists are looking for answers that invoke the evolution of entropy, says ...