Constellation knowledge_What galaxies are there in Andromeda?

"Andromeda", one of the eighty-eight constellations, is Andromeda in Greek mythology. Regarding galaxies, most people's knowledge in this area is still relatively shallow. So what galaxies are there in Andromeda? Let’s take a look with Constellation Knowledge.

There is a main galaxy in Andromeda, the Andromeda Galaxy, which is one of the largest members of the galaxy group. Located below the Ursa Major and near the constellation Pegasus. The fairy's head is Albedo, one of the horns of the quadrilateral of Pegasus. The Andromeda Extragalactic Galaxy is a celestial system like the Milky Way; the satellite galaxies of the Andromeda Galaxy discovered before 1900, such as the elliptical galaxy M32, the elliptical galaxy M110, and the dwarf elliptical galaxies NGC185 and NGC147.

The total magnitude of the Andromeda Nebula is magnitude 4, and the average brightness per unit area is magnitude 6. It is vaguely visible to the naked eye on a clear, moonless night, like a small piece of white cloud. Its soft, silvery-white oval shape can be seen through a small telescope. The Andromeda Nebula is a typical spiral galaxy, but because it faces us sideways, it is not easy to see its spiral arms. Through a larger-diameter astronomical telescope, you can see some of its structures. For example, its core is particularly bright, and it gets brighter toward the center. You can also see part of the spiral arms, black dust lines, globular star clusters, and star clouds. .

In addition, you can also see its two dwarf galaxy companions, a small, round, and very dense elliptical galaxy M32 to the south of the core of M31, and the other is slightly fainter but smaller than M32 The larger and elongated elliptical galaxy M110 is to the northwest of M31. There are also many fainter stars in the Milky Way that fill this sky area, adding to the fascinating colors of the Andromeda Nebula.

The Andromeda Galaxy is the closest large galaxy to our Milky Way. It is generally believed that the appearance of the Milky Way is very similar to the Andromeda Galaxy, and both dominate the Local Galaxy Group. The diffuse light of the Andromeda Galaxy is contributed by hundreds of billions of star members. Several bright stars surrounding the image of the Andromeda Galaxy are actually stars in our Milky Way Galaxy, much closer than the background objects. The Andromeda Galaxy is also known as M31 because it is the diffuse object No. 31 in the famous Messier Cluster Nebula Catalog. M31 is so far away that light from it takes 2 million years to reach Earth. The stars in the nebula can be divided into about 20 groups, which means they may come from smaller galaxies that Andromeda "swallowed".