Question

When did Edwin Hubble announce the discovery of galaxies outside Milky Way?
a) 1915
b) 1924
c) 1922
d) 1918

Answer 1

Hubble announces discovery of other galaxies, December 30, 1924. In 1924, American astronomer Edwin Hubble changed our understanding of the universe when he introduced the existence of other galaxies beyond the Milky Way Galaxy. Until then, the Milky Way was thought to be the entire universe.