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-The Andromeda Galaxy is also scientifically referred to as Messier 31 or just M31.
-Some scientist estimate that there are possibly 1 trillion stars within that galaxy.
-In about 4 billion years it's said by many scientist that the Andromeda Galaxy will crash and collide with our
Galaxy.
-The Andromeda Galaxy  has a double nucleus, that which within the middle of this cluster of stars you'll find at the core a super massive black hole.

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The Milky Way and the Andromeda Galaxy are the two biggest galaxies within their respective local area of surrounding galaxies. The Andromeda Galaxy actually being the biggest in the group and the Milky Way Galaxy coming in at second biggest. Both of these galaxies claiming about a dozen surrounding  satellite galaxies. The mass between these two is big enough to make at least billions of stars. Astronomers also believe that our local group of galaxies are apart of an gigantic cluster, filled with thousands of galaxies, known as the Vertigo Cluster.

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History of the human knowledge of the Andromeda Galaxy 

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History of the human knowledge of the Andromeda Galaxy 

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The Andromeda Galaxy has been known to exist by humans for some time now, and at one point it was referred to as the Andromeda Nebula. At the time astronomers thought it was a young solar system that was trying to form into a proper solar system. Way later in the 20th century we discovered that the Andromeda Nebula had multiple stars that seemed like other planets so we weren't sure weather it was apart of our own galaxy or a entire one on it's own. But in 1920, thanks to the invention of the Hubble Telescope, we were able to confirm that it was indeed it's own separate galaxy.

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The Andromeda Galaxy can be seen just about all year long with a telescope, but during late September and October, in the eastern part of the sky you can see the Andromeda Galaxy with the naked eye. Also during a winters night the Andromeda Galaxy is also easy to see. You can also find the Andromeda Galaxy using constellations such as  Cassiopeia and the Great Square of Pegasus

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The Andromeda Galaxy is the closet galaxy to our Milky Way Galaxy. From us its a total of 2.3 million light years away, but at night while looking at the stars the naked human eye can see a very tiny cluster of light, which is the Andromeda Galaxy.

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1.http://earthsky.org/clusters-nebulae-galaxies/andromeda-galaxy-closest-spiral-to-milky-way
2.https://www.nasa.gov/feature/goddard/2017/messier-31-the-andromeda-galaxy
3.https://cosmology.carnegiescience.edu/timeline/1929/andromeda-galaxy
http://factslegend.org/20-interesting-andromeda-galaxy-facts/