The Andromeda Galaxy is a couple of million light-years away, and it's the farthest thing that can be seen with the naked eye. The picture above is what it might look like if our eyes responded to infrared and radio wavelengths. It was assembled using data from the ESA Herschel and Planck satellites and NASA's Infrared Astronomy Survey and Cosmic Background Explorer, supplemented with ground-based data from the Green Bank, WRST, and IRAM radio telescopes.
Image Credits: ESA / NASA / NASA-JPL / Caltech / Christopher Clark (STScI) / R. Braun (SKA Observatory) / C. Nieten (MPI Radioastronomie) / Matt Smith (Cardiff University)
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