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500 years of stellar sightings - 

Scientific American cataloged the 5 centuries of the “greatest comets ever seen,’ from 1577’s “broom star” to 1965’s Ikeya-Seki, which was visible during broad daylight. 

(Image above is of Comet C/2001 Q4, taken by Kitt Peak National Observatory in Arizona)

Full story: http://www.scientificamerican.com/article.cfm?id=comets-of-the-centuries&WT.mc_id=SA_DD_20131227

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