It's a very good post, but I have some facts about The Andromeda Galaxy :

-The Andromeda Galaxy is approaching the Milky Way at approximately 100 to 140 kilometres per second.
-While Andromeda is the largest galaxy in the Local Cluster it may not be the most massive. The Milky Way is thought to contain more dark matter, which could make it much more massive.
-There are at least 450 globular clusters orbiting in and around the Andromeda Galaxy. Some of them are among the most densely populated globulars ever seen.
-The Andromeda Galaxy is the most distant object you can spot with the naked eye. You need a good spot away from bright lights in order to see it.
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