Discover how Einstein’s theory of special relativity reshaped physics by linking space, time, mass, and energy in a universe governed by the speed of light.

Once again, scientists have shown that Albert Einstein's theory of special relativity is right — this time, thanks to a particle detector buried deep beneath Antarctica.

However, even though the rules for calculating kinetic energy (or the energy of motion) of an object are different in special relativity from how they are in Newtonian mechanics, energy is still ...

The researchers wondered if these tiny, high-energy particles would deviate from the behavior predicted by the theory of special relativity.

The idea of a particle that races faster than light has long fascinated physicists. Known as the tachyon, it was originally dreamed up to help untangle paradoxes in quantum theory and relativity.

There may be an infinite amount of energy locked in the vacuum of space-time. So could we ever harness this energy for anything useful?

Einstein put forth special relativity, which explains motion at near-light speeds. Although there are many consequences of Special Relativity, this complex theory consists of only two postulates ...

Later in 1905 comes an extension of special relativity in which Einstein proves that energy and matter are linked in the most famous relationship in physics: E = mc2.

The top equations in astronomy include those describing Newton’s laws, Maxwell’s equations, Einstein’s relativity, and Hubble’s law.

Special relativity is also based on a second assumption that gives the speed of light — 186,000 miles per second (300 million meters per second) — in a vacuum a special status.

Einstein’s special theory of relativity governs our understanding of both the flow of time and the speed at which objects can move. In special relativity, the speed of light is the ultimate speed ...