Andromeda Spiral Galaxy Messier 31 (M31) May 21, 2015 23:07

The Andromeda Galaxy is our nearest Spiral Galaxy.  Also known as Messier 31 or simply M31 this galaxy is on a collision course with our own Milky Way Galaxy.  Fortunately at approximately 2.5 million light-years away we will not have to worry about this collision which is estimated to occur more than 3 billion years from now.  The Andromeda Galaxy's bright core is the only part of the galaxy that is visible with the naked eye at night.  If you could see the entire Galaxy at night such as with a powerful enough telescope, it would span across the sky 6 times the distance that of the moon!  The total mass of the Andromeda Galaxy is believed to be approximately the same as our own Milky Way Galaxy.  The Andromeda Galaxy is only 1 of approximately 30 other galaxies within the Local Group.  See our Andromeda Galaxy posters using the following links:

    1. NASA Andromeda Galaxy
    2. Milky Way Andromeda Galaxy Collision
    3. Fiery Andromeda
    4. Andromeda M31 Neighbor Galaxy
    5. Warped Andromeda by WISE
    6. Andromeda Optical