Andromeda Galaxy, also known as Messier 31 or M31, is a spiral galaxy located about 2.5 million light-years away from Earth. Located in the Andromeda constellation, it is the closest major spiral galaxy to the Milky Way, where our solar system is, but it isn’t the closest galaxy. It is also the largest galaxy of what is called the Local Cluster - a collection of more than 54 galaxies including the Milky Way. While Andromeda is the largest galaxy in the Local Cluster it may not be the most massive. It has a diameter of about 165,000 light-years and contains at least 200 billion stars.
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December 2016
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