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.

On this day in 1905 Albert Einstein published his paper introducing special relativity in a German physics journal. Entitled ...

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 ...

If special relativity were correct, they'd remain unchanged, which cannot be correct. Instead, to conserve energy, we have to accept that light must change its wavelength ...

Special relativity was discovered first, by Einstein, in 1905. Two years later, in 1907, Michelson was awarded the Nobel Prize for his interferometer experiments proving the constancy of the speed ...

Special relativity declares a similar law for all motion: The combined speed of any object's motion through space and its motion through time is always precisely equal to the speed of light.

The idea of a particle that races faster than light has long fascinated physicists. Known as the tachyon, it was originally ...

Special relativity inter-relates space and time in such a way that the speed of light is constant, and the theory leads to situations where two observers can disagree over time intervals and ...

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

What is length contraction in relativity? Length contraction is a phenomenon predicted by Einstein's theory of special relativity. It states that the length of a moving object decreases in the ...