The Great Square of Pegasus is an asterism formed by three bright stars in Pegasus constellation – Markab, Scheat and Algenib – and Alpheratz in the neighbouring constellation Andromeda. For northern observers, the asterism is particularly prominent in the summer months, when it can be seen high overhead in the evening.
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Andromeda Galaxy (also known as Messier 31, M31, or NGC 224) is a spiral galaxy located in the Andromeda constellation. The galaxy was named after the constellation which, in turn, was named after the mythical princess Andromeda, daughter of Cassiopeia and Cepheus in Greek mythology.
Andromeda Galaxy is one of the most famous objects in the night sky, and the nearest spiral galaxy to our own, the Milky Way. It is on a collision course with the Milky Way, and the two galaxies are expected to merge in about 4 billion years.
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