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Andromeda Galaxy

Andromeda Galaxy (Picture 1)


The Andromeda Galaxy, a spiral galaxy with a huge disk-like structure in the direction of Andromeda, is numbered M31 in the Messier catalogue, NGC 224 in the new nebula cluster, with a diameter of 220,000 light years, and the distance from the Earth is 2.54 million light years. The Andromeda Galaxy is the closest large galaxy to the Milky Way. The fairy galaxies appear to be spindle-shaped elliptical spots in the northeastern sky, one of the most distant objects visible to the naked eye. The Andromeda Galaxy and the Milky Way are in the same group of galaxies. If dark matter is counted, the quality of the galaxies is smaller than that of the Milky Way, and the diameter is at least 1.6 times that of the Milky Way. The Andromeda Galaxy is the largest galaxy in its own group of galaxies. It is moving towards the Milky Way at a speed of 300 kilometers per second. It may hit the Milky Way after 3 to 4 billion years, and finally synthesize the elliptical galaxy.

As early as the 18th century, Immanuel Kant believed that such nebulae might be a huge star system outside the Milky Way, a view that was not confirmed until the early 20th century. Another market view is that the nebula is the area where the gas dust clouds inside the Milky Way form stars. In the 1920s, Edwin Hubble used the new 100-inch (2.54 m) telescope from the Mount Wilson Observatory to identify individual stars in the outer zone of the Andromeda Nebula. Some of these stars are Cepheid variable stars. Since the changes in Cepheid variable stars are related to their absolute magnitude, Hubble is able to calculate the distance from their apparent brightness to the Andromeda galaxy, thus proving that it is indeed another independent galaxy.

Hubble's estimated distance, which was later largely confirmed by Walter Baade's research, has increased. Hubble's work confirmed that the Milky Way is just one of many galaxies, and the universe extends far beyond the boundaries of the Milky Way. At a distance of 700 kiloseconds, the diameter of the Andromeda Galaxy will be 50 kiloseconds, roughly double the size of our Milky Way, with about 400 billion stars.

It is generally believed that the appearance of the Milky Way is very similar to that of the Andromeda Galaxy, which together dominate the galaxies. The diffuse light of the Andromeda Galaxy is made up of hundreds of billions of stars. A few bright stars around the image of the Andromeda Galaxy are actually the stars in our galaxy, much closer than the background objects. The Andromeda Galaxy is also known as M31 because it is the No. 31 diffuse object in the famous Messi Star Cluster Nebula. The stars in the nebula can be divided into about 20 communities, which means they may come from smaller galaxies that the Andromeda galaxy "swallows". The Andromeda galaxy is at least 50 kiloseconds in diameter (160,000 light years), 1.5 times the diameter of the Milky Way (the Milky Way is 100,000 light years in diameter) and is the largest galaxies in the group. There are many similarities between the Andromeda Galaxy and the Milky Way. A comparative study of the two can provide important clues for understanding the movement, structure, and evolution of the Milky Way.

The Andromeda Nebula is the most beautiful celestial body in the autumn night sky. It is also the first celestial body to prove to be an extragalactic galaxies, or the most distant celestial body visible to the naked eye. Dark matter is probably the most quality of the group. The Spitzer Space Telescope observation shows that the Andromeda Galaxy has nearly one trillion (1 trillion) stars, far more than our Milky Way. In 2006, the quality of the Milky Way was re-estimated to be about 50% of the Andromeda galaxy, about 7.1 × 10 ^ 12 solar mass. The Andromeda galaxy is easily visible to the naked eye in a moderately dark sky, but such a sky exists only in small towns, isolated areas, and far from the population-concentrated areas, and is only exposed to light-light pollution. The Andromeda galaxy seen by the naked eye is very small, because it has only a small area in the center with sufficient brightness, but the complete angular diameter of this galaxy is seven times larger than the full moon.

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