WISE Infrared Andromeda
http://apod.nasa.gov/apod/
This is a picture of the Andromeda galaxy, taken in infrared light and rendered as a false color image. It is a mosaic of pictures taken from the Wide-field Infrared Survey Explorer. The yellow and red portions of the picture consist of dust heated by the galaxy's younger stars, and the blue areas are created by its older stars. Andromeda, or M31, is 2,500,000 light years away and is the farthest object from the Milky Way that is visible with the naked eye. It has twice the diameter of the Milky Way, but may be less massive. 2006 observations by the Spitzer Space Telescope suggest that Andromeda has about one trillion stars, which is large compared to the estimated 200-400 billion stars of the Milky Way.
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