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A distinctive pattern of stars that forms part of one or more constellations. For example, the familiar shape of the Plough or Big Dipper is an asterism within the constellation Ursa Major, while the Square of Pegasus and the False Cross are asterisms formed from stars of more than one constellation. The term is also used to describe a group of stars that appear to form a cluster, even though they are not related.

Subjects: Astronomy and Astrophysics.

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