Constellation knowledge: Is there life in Andromeda galaxy?

Speaking of Andromeda galaxy, we always think there are fairies. The Andromeda galaxy M3 1 is the largest galaxy closest to the banking system and one of the most distant celestial bodies visible to the naked eye. So is there life in Andromeda galaxy? Let's reveal the constellation knowledge for everyone! Let's have a look!

Is there life in Andromeda galaxy?

Whether there is life in Andromeda galaxy is still inconclusive, but some people think that there will be life in the galaxy, and even the existence of higher intelligent creatures is not ruled out.

The reason is that Andromeda galaxy is as big as the Milky Way, and it is slightly bigger than the Milky Way. According to the research of American scientists, it is estimated that there are 40 billion Earth-like planets in our galaxy alone (some people say there are 2 billion, 60 billion and so on). In short, the number is amazing), and these planets all have the conditions to support the existence of life, which means that there may be alien life not far from the earth.

In the universe, billions of extra-galactic galaxies as huge as our own Milky Way have been discovered, and there is a high possibility of alien life in other galaxies. Some people think that Andromeda galaxy is as alive as the Milky Way. However, because Andromeda galaxy is too far away from human beings, perhaps human beings will never be able to detect possible life there.

Brief introduction of Andromeda galaxy

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.

As early as the18th century, Immanuel Kant thought that this nebula might be a huge star system outside the Milky Way, which was not confirmed even at the beginning of the 20th century. Another market-oriented view holds that nebulae are regions in the Milky Way where gas and dust clouds form stars. This problem was solved in the 1920s, when Edwin Hubble used the newly-built 100 inch (2.54m) telescope at Mount Wilson Observatory to identify individual stars in the outer region of Andromeda Nebula.

Some of these stars are Cepheids. Because the variation of Cepheid variables is related to their absolute magnitude, Hubble can calculate the distance to Andromeda galaxy from their apparent brightness, which proves that it is indeed another independent galaxy.

The distance estimated by Hubble, which was later mainly studied by Walter Baade?, was increased after several revisions. Hubble's work proves that the Milky Way is just one of many galaxies, and the scope of the universe goes far beyond the boundaries of the Milky Way. At a distance of 700,000 parsec, the diameter of Andromeda galaxy will be 500,000 parsec, which is about twice that of our Milky Way galaxy and contains about 400 billion stars.

It is generally believed that the appearance of the Milky Way is very similar to Andromeda, and both of them dominate the local galaxy group. The diffuse light of Andromeda galaxy is composed of hundreds of billions of star members. The bright stars around the Andromeda galaxy image are actually stars in our galaxy, which are much closer than the background objects. Andromeda galaxy is also called M3 1 because it is the No.31dispersoid in the list of the famous messier cluster nebulae. The stars in the nebula can be divided into about 20 communities, which means that they may come from smaller galaxies "swallowed up" by Andromeda.

The diameter of Andromeda galaxy is at least 50,000 parsec (10.6 million light years), which is10.5 times the diameter of the Milky Way (the diameter of the Milky Way is10 million light years). It is the largest galaxy in this galaxy group. Andromeda galaxy has many similarities with the Milky Way. A comparative study of them can provide important clues for understanding the movement, structure and evolution of the Milky Way.

Andromeda Nebula is the most beautiful celestial body in the autumn night sky, the first celestial body proved to be an extragalactic galaxy, and the farthest celestial body visible to the naked eye. Dark matter is probably the most massive substance in this group. The observation of Spitzer Space Telescope shows that Andromeda galaxy has nearly1000 trillion stars, far exceeding our Milky Way galaxy. In 2006, the mass of the Milky Way was re-estimated to be about 50% of the mass of Andromeda galaxy, about 7. 1× 10 12 solar mass (symbol: M☉).

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.