GALEX mosaic image of M31.
The GALEX observation of the large galaxy in Andromeda, Messier 31, was performed during September and October 2003. The image is a mosaic of 10 separate GALEX images combining the FUV (colored blueand NUV detector (colored red) images together to make a color image of the sky nearly six full moons across.
The GALEX image shows blue regions of young, hot, high mass stars tracing out the spiral arms where star formation is occurring, and the central orange-white "bulge" of old, cooler stars formed long ago. The red stars in this image are foreground stars in our own Milky Way galaxy.
The companion galaxies M32 and M110 are well visible in this image. See an annoted version of this image.
From the GALEX Image Gallery
Last Modification: December 19, 2003