First Spiral Galaxy Discovered. French astronomer, Charles Messier, discovered the Whirlpool Galaxy. Also known as Messier 51a, the galaxy is about 30 million light-years from Earth. A spiral galaxy is a type of galaxy where stars, gasses, and other cosmic dust particles rotate or revolve in a spiral around a central bulge. Astronomers think that the bulge consists of a black hole.
Timeline of knowledge about galaxies, clusters of galaxies, and ...