Perseus, << PUR see uhs, >> is a constellation of the northern sky. It lies between the constellations of Auriga and Cassiopeia. Mirfak, the brightest star in Perseus, is larger than the sun. Perseus contains the binary star Algol. The pair of stars called Algol periodically eclipse each other, so that Algol appears alternately fainter and brighter (see Algol ). In Greek mythology, Perseus won this place among the stars for cutting off the head of the monster Medusa. See also Constellation .
