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This is a little illustration for the new M101 composite image. The different wavelengths are colored according to their relative energy levels. The images are then added together to represent what we might see if our eyes could see an expanded spectrum.
Red - Infrared - Spitzer Space Telescope
Green - Visible - Hubble Space Telescope
Blue - X-Ray - Chandra Space Telescope
Made with Blender (blender.org).
(Images courtesy NASA)