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Section of the Galactic Plane

This is a section of the Galactic plane measured with the Spitzer Space Telescope. In this four-color composite, blue is 3.6 microns, green is 4.5 microns, orange is 5.8 microns, and red is 8.0 microns. Image credit: NASA/JPL-Caltech/E. Churchwell (University of Wisconsin).