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keithpeter
on Aug 1, 2014
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J002E3
Might be worth mentioning the use of doppler shift of the known patterns of spectral lines associated with elements to get information about radial velocity of e.g. a star being observed.
https://www.e-education.psu.edu/astro801/content/l4_p7.html
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https://www.e-education.psu.edu/astro801/content/l4_p7.html