Albert Einstein's theory of relativity is actually two separate theories: his special theory of relativity, postulated in the 1905 paper, The Electrodynamics of Moving Bodies and his theory of general ...

0:00 - Why time is a dimension 1:43 - Speed of light was a problem 3:54 - How Einstein resolved problem 4:54 - Minkowski ...

Of the more than 4,500 stars known to have planets, one puzzling statistic stands out. Even though nearly all stars are expected to have planets and most stars form in pairs, planets that orbit both ...

The American astrophysicist explains how relativity allows us to experience the passage of time at different rates, and why ...