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Spectrum of Light from Hydrogen

  1. Oct 17, 2013 #1
    The visible spectrum of light from hydrogen displays four wavelengths, 410 nm, 434 nm, 486 nm, and 656 nm normally.

    Which changes when a telescope is pointed at a Galaxy that is moving away?
  2. jcsd
  3. Oct 17, 2013 #2


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    They all change; the same goes for the wavelengths which are not visible.

    The process is detailed here: http://www.astro.ucla.edu/~wright/doppler.htm

    Note that the ratio of observed over emitted wavelength is the same for all wavelengths; this is how we determine the red shift.
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