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===In astronomy=== * Astronomers have reported that [[Stellar classification|spectral class]] T brown dwarfs (the ones with the coolest temperatures except for the recently discovered Y brown dwarfs) are colored magenta because of absorption by [[sodium]] and [[potassium]] [[atom]]s of light in the green portion of the spectrum.<ref>[http://www.darkstar1.co.uk/ds3.htm Brown Dwarves] (go halfway down the website to see a picture of a magenta brown dwarf)</ref><ref>Burrows et al. The theory of brown dwarfs and extrasolar giant planets. Reviews of Modern Physics 2001; 73: 719β765</ref><ref>[http://spider.ipac.caltech.edu/staff/davy/2mass/science/comparison.html An Artist's View of Brown Dwarf Types] {{Webarchive|url=https://web.archive.org/web/20111117180311/http://spider.ipac.caltech.edu/staff/davy/2mass/science/comparison.html |date=2011-11-17 }} (26 June 2002) Dr. Robert Hurt of the Infrared Processing and Analysis Center</ref> <gallery mode="packed" heights="160"> File:T-dwarf-nasa-hurt.png|Artist's vision of a spectral class T brown dwarf </gallery>
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