Hubble/GALEX/Spitzer Composite Image of M81
This image combines data from the Hubble Space Telescope, the Spitzer Space Telescope and the Galaxy Evolution Explorer (GALEX) missions. The GALEX ultraviolet data were from the far-UV portion of the spectrum (135 to 175 nm). The Spitzer infrared data were taken with the IRAC 4 detector (8 μm). The Hubble data were taken at the blue portion of the spectrum.