The Einstein zig-zag could help answer big questions, like how fast the universe is expanding and what dark energy really is. At the heart of this system, labeled J1721+8842, lies a single quasar.

On May 29, 1919, a total solar eclipse helped to prove Albert Einstein's theory of general relativity. Einstein's theory suggested that gravity could bend light by curving the fabric of spacetime.

Does the exploding sun affect the earth immediately or only after 8 minutes? Einstein created the General Theory of Relativity in 1915 to answer this question.