A theoretical particle that travels faster than light, the tachyon has long intrigued physicists and fueled decades of ...

Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of what the universe looked like in the moments before it rapidly changed ...

Traditional black holes, as predicted by Albert Einstein's theory of General Relativity, contain what are known as ...

Warp drives like in 'Star Trek' may actually be possible in the future and engines could power transport at the speed of light, according to a new study.

The theory is a series of equations defined by Einstein. These equations combine space and time to create space-time. Gravity is explained by these equations, which are consistent with what we see ...

Einstein’s ... the theory of relativity is the nature and behavior of light. In the 19th century, the prevailing idea was that light is a wave motion, and therefore needs a medium to travel ...