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  • Rights: Public domain Published 18 February 2021 Size: 330 KB Referencing Hub media

    Part of spectrum viewed: Radio (wavelengths a lot longer than visible light).

    Location: On the ground, as most radio waves get through the atmosphere.

    Sources of radiation:

    • Many radio waves in space come from cold clouds of hydrogen gas.
    • Most stars do not give off many radio waves.

    Image: A composite image of the Whirlpool Galaxy, using radio and visible light wavelengths. The white is how the galaxies appear to optical telescopes – one giant spiral galaxy with a smaller one hanging off an arm. The Very Large Array radio telescope array sees a much bigger picture. © B. Saxton (NRAO/AUI/NSF) with data provided by J. Hibbard, CC BY 3.0.

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