called the Andromeda Nebula (after the constellation in which it was located). It was entry 31 in Charles Messier's 18th century catalog of interesting fuzzy objects, and is thus also called M31 ...

Clockwise from upper left: Rosette Nebula [1000 mm, f/8, Konica SRG3200, 2 x 10 min, stacked] Great Andromeda Galaxy (M31) [500 mm, f/4, Fuji Super G 800, 3 x 16 min, stacked] Comet Hale-Bopp [500 mm, ...

At a meeting of the American Astronomical Society in January 1925, a paper read by one of his colleagues on his behalf reported that the Andromeda nebula, also called M31, was nearly a million light ...

At a meeting of the American Astronomical Society in January 1925, a paper read by one of his colleagues on his behalf reported that the Andromeda nebula, also called M31, was nearly a million ...