This 22-second animation uses an "infrared spotlight" to highlight differences between a visible-light image of Messier 81 and the Spitzer/MIPS+IRAC infrared view.
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The Spitzer Space Telescope is a NASA mission managed by the Jet Propulsion Laboratory. This website is maintained by the Spitzer Science Center, located on the campus of the California Institute of Technology and part of NASA's Infrared Processing and Analysis Center.