Andromeda (mythology) Andromeda (mythology) In Greek mythology, Andromeda (; Greek: Ἀνδρομέδα, "Androméda" or Ἀνδρομέδη, "Andromédē") is the daughter of the Aethiopian king Cepheus and his wife Cassiopeia. When Cassiopeia's hubris leads her to boast that Andromeda is more beautiful than the Nereids, Poseidon sends the sea monster Cetus to ravage Andromeda as divine punishment. Andromeda is chained to a rock as a sacrifice to sate the monster, but is saved from death by Perseus. Her name is the Latinized form of the Greek ("Androméda") or ("Andromédē"): "ruler of men", from ("anēr, andrós") "man", and "medon", "ruler". As a subject, Andromeda has been
Andromeda Galaxy Andromeda Galaxy The Andromeda Galaxy (), also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth, and the nearest major galaxy to the Milky Way. Its name stems from the area of the sky in which it appears, the constellation of Andromeda. The 2006 observations by the Spitzer Space Telescope revealed that the Andromeda Galaxy contains approximately one trillion stars, more than twice the number of the Milky Way's estimated 200 to 400 billion stars. The Andromeda Galaxy's mass is estimated to be around 1.76 times that of the