Add Yahoo as a preferred source to see more of our stories on Google. Scientists combine sky wide gamma ray data to refine tests of Einstein’s constant light speed. (CREDIT: Shutterstock) The speed of ...

The constancy of the speed of light is a pillar of modern physics, but questions persist about its absolute universality. Advanced theories, seeking to unify general relativity and quantum mechanics, ...

It seems it is not possible to form black holes out of light alone. If energy and mass are one and the same, as Albert Einstein’s theories posit, then it should be possible to create a region of light ...

If gravity arises from entropy, scientists could unite Einstein's general relativity with the quantum realm while shedding light on dark matter and dark energy. When you purchase through links on our ...

In an effort to bring together the domains of gravity and quantum theory, Albert Einstein and Nathan Rosen proposed a striking concept in a 1935 paper. In that work, they described an abstract ...

The speed of light has been one of science’s most trusted markers of stability. For more than a century, the idea that light moves through space at a constant speed has supported some of physics’ most ...