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  • Rights: Public domain Published 18 February 2021 Size: 9.3 MB Referencing Hub media

    Part of spectrum viewed: Infrared (wavelengths longer than visible light).

    Location: In orbit, as most infrared is blocked by the atmosphere.

    Sources of radiation:

    • Stars give off infrared as well as visible light.
    • Cool stars give off more infrared than visible light.
    • Dust that has been heated gives off infrared.
    • Infrared can pass through dust clouds.

    Image: The Milky Way imaged by Spitzer. This infrared image shows what cannot be seen in visible light – cooler stars (blue), heated dust (reddish hue) and Sagittarius A-Star as a bright white spot in the middle. Image by NASA/JPL-Caltech/S. Stolovy (Spitzer Science Center/Caltech) and released into the public domain.

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