Cassiopeia is a smaller constellation of stars in the Northern Hemisphere. This constellation can be seen easily without a telescope or binoculars. It is found in the sky at night to the left of the Big Dipper. The Big Dipper is also known as Ursa Major, the Great Bear. It looks like a sideways 'W' near the North Star, Polaris. Cassiopeia was the mother of Andromeda in Greek mythology. For this reason, the Greeks called another constellation close to Cassiopeia, Andromeda. While watching the constellation Cassiopeia, a Danish astronomer in 1572 named Tycho Brahe witnessed a supernova. One of the stars had exploded creating a massive supernova.
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