Oct. 5th, 1923: Hubble discovers galaxies beyond the Milky Way

Edwin Hubble discovered galaxies beyond the Milky Way on October 5th, 1923, by observing changes in the brightness of a star in the Andromeda Nebula. This historic finding expanded our understanding of the universe and its vast scale, inspiring generations of sky-watchers and astronomers. As a result, stargazers can now appreciate the Andromeda Galaxy, a prominent sight in the night sky, as a separate galaxy beyond our own. Sky enthusiasts can look for the Andromeda Galaxy on clear fall nights in the Northern Hemisphere.