Andromeda was the daughter of Cepheus and Cassiopeia who boasted herself to be more
beautiful than the Nereid sea-maidens. Poseidon the sea-god sent a monster as a punishment,
that would only be placated by the sacrifice of Andromeda herself. Perseus came to her rescue
and, with the aid of Medusa's head, turned the ravaging beast to stone.
What Andromeda lacks in bright stars it more than compensates for in galaxies, and
one galaxy in particular. In the central regions of the constellation is M31, much better
known as the Andromeda Galaxy. This is a huge spiral galaxy about twice the size of our own,
and a near neighbour in galactic terms. Nonetheless, its distance of 2,300,000 light years makes it the
most distant object visible with the naked eye.