With his theory of General Relativity in 1915, Albert Einstein revolutionized how we think about our universe. Rather than the cosmos simply providing the room for the planets and stars to orbit each other, space and time themselves were now dynamical entities in one ever-evolving play with matter and light.
Einstein’s equations described how stars, galaxies and all other matter curve or warp space and time. The galaxies and the light rays then travel in this distorted space-time according to the equation provided by the 18th-century Swiss mathematician Leonhard Euler.
