Simon Marius, the first to observe it through a telescope, described it as a "candle shining through horn.
Walter Baade found a second type of Cepheid variable stars in its globular cluster because they are much fainter than ones in this object's Population I regions. SN 1885, the first supernova to be discovered outside the Milky Way was discovered here by Ernst Hartwig, and the brightest globular cluster in the local group, Globular One, is located in it. Simon Marius, the first to observe it through a telescope, described it as a "candle shining through horn." It shares its name with a constellation whose alpha star is Alpheratz. Called M31 in the Messier Catalog, for 10 points, identify this large spiral galaxy closest to the Milky Way.
Walter Baade found a second type of Cepheid variable stars in its globular cluster because they are much fainter than ones in this object's Population I regions.
Andromeda