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Spitzer image of Arp 16, also known as M66.

In this infrared image of M66 from the Spitzer Infrared Nearby Galaxy Survey (SINGS), we see a stark contrast between the blue core and bar with a concentration of blue older stars, and the pink bar ends and spiral arms that show dust heated by actively forming stars.

Credit: NASA/JPL-Caltech/R. Kennicutt (University of Arizona) and the SINGS Team
Source: https://www.spitzer.caltech.edu/image/sig05-016-ngc-3627-m66

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