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

Euclid space telescope sent some images back to Earth during an early testing phase. While reviewing the pictures, astronomer and Euclid archive scientist Bruno Altieri found something incredibly rare ...

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 ...

According to Einstein’s theory, simultaneous events in one ... This is because it takes time for the light to travel. So when the train is in motion, the light will have to cover that extra ...

Warp drives like in 'Star Trek' may actually be possible in the future and engines could power transport at the speed of ...

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 ...

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 ...