February 25, 2010
This image from NASA's Wide-field Infrared Survey Explorer, or WISE, highlights the Andromeda galaxy's older stellar population in blue. It was taken by the shortest-wavelength camera on WISE, which detects infrared light of 3.4 microns. A pronounced warp in the disk of the galaxy, the aftermath of a collision with another galaxy, can be clearly seen in the spiral arm to the upper left side of the galaxy.
Topics: Technology Internet, Andromeda constellation, Spiral galaxies, Local Group, National Aeronautics and Space Administration, Galaxies in fiction, Wide-field Infrared Survey Explorer, Spitzer Space Telescope, Infrared telescopes, Andromeda Galaxy, Galaxy