Introduction of Andromeda galaxy constellation knowledge

In the vast universe, there are stars of all sizes. Most people have a shallow understanding of galaxies. We often hear about the solar system and the Milky Way. Do you know the Andromeda galaxy? Next, the constellation knowledge will introduce you to the related knowledge of the fairy guitar galaxy. Let's have a look!

Andromeda galaxy, also known as Andromeda nebula, is a spiral galaxy with a huge disk structure in Andromeda. It is numbered M3 1 in messier catalog and NGC 224 in the new catalogue of nebula clusters, with a diameter of 220,000 light years and a distance of 2.54 million light years from the Earth. It is the largest galaxy closest to the Milky Way.

Andromeda galaxy looks like a spindle-shaped oval spot in the northeast sky and is one of the most distant celestial bodies visible to the naked eye.

Andromeda and the Milky Way are both in this galaxy group, with twice the mass and at least twice the diameter of the Milky Way. Andromeda galaxy is the largest galaxy in this galaxy group, and it is moving towards the Milky Way at a speed of 300 kilometers per second. After 3-4 billion years, it may hit the Milky Way and eventually synthesize an elliptical galaxy.

Andromeda galaxy is easy to see with the naked eye in a moderately dark sky environment, but such a sky only exists in small towns, isolated areas and places far away from densely populated areas, and is only slightly polluted by light. Andromeda galaxy is very small to the naked eye, because only a small area in the center has enough brightness, but the complete angular diameter of this galaxy is seven times that of the full moon.