Visible in the Northern Hemisphere from August -
January, and visible in the Southern Hemisphere in November.
Named for Andromeda princess of Greek mythology
Andromeda Galaxy both nearest major galaxy and most
distant object that can be seen with naked eye.
Before its nature determined by powerful
telescopes, mistakenly believed to be a nebula
telescopes seen to have two small companion galaxies of elliptical form – M32 and M110.
A spiral galaxy like our Milky Way
Much larger than our Milky Way – diameter of 150,000 light years – named the Great
Galaxy frequently referred to as M31 – 31st
object on Messier’s list of diffuse sky objects.
Takes about two million years for light to reach us from
M31 – distance of 2 million light years.
Much about M31
remains unknown, including why center contains two nuclei, discovered by Hubble
Space Telescope in 1991.