Messier catalogued many objects, some of which were galaxies, but he did not know what they were. It was Hubble who first figured out (in the 1920s) that there

Messier catalogued many objects, some of which were galaxies, but he did not know what they were. It was Hubble who first figured out (in the 1920s) that there were definitely separate galaxies. https://lco.global/spacebook/galaxies/history-discovery/ https://lco.global/spacebook/galaxies/history-discovery/