The theory of special relativity, first proposed by Einstein in 1906, includes the universal constant that nothing can travel faster than light in the vacuum of space. It took several centuries to precisely narrow down the exact speed of light, but in 1983 it was tied to the definition of the metre by the International System of Units at 299, 792, 458 metres per second.
Theoretically, then, that’s the fastest speed that anything can travel in space. Recently workers at CERN (the world’s largest particle physics laboratory) announced that they had recorded a type of subatomic particle called a neutrino going faster than the speed of light. It hasn’t been confirmed yet, but if true, it could change everything about the world of physics.