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Hale–Bopp

Hale–Bopp a periodic comet which passed close to the sun in the spring of 1997 and was one of the brightest of the 20th century. It was exceptionally large and active, has a period of just over 4,000 years, and was the first comet to exhibit a sodium tail. Named after Alan Hale and Thomas Bopp, the American astronomers who discovered it (independently of each other).

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"Hale–Bopp." The Oxford Dictionary of Phrase and Fable. . Encyclopedia.com. 21 Aug. 2017 <http://www.encyclopedia.com>.

"Hale–Bopp." The Oxford Dictionary of Phrase and Fable. . Encyclopedia.com. (August 21, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/hale-bopp

"Hale–Bopp." The Oxford Dictionary of Phrase and Fable. . Retrieved August 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/hale-bopp

Hale—Bopp

Hale—Bopp A comet with an orbital period of more than 4000 years; perihelion date 31 March 1997; perihelion distance 0.914 AU.

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Pick a style below, and copy the text for your bibliography.

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"Hale—Bopp." A Dictionary of Earth Sciences. . Encyclopedia.com. 21 Aug. 2017 <http://www.encyclopedia.com>.

"Hale—Bopp." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 21, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/hale-bopp

"Hale—Bopp." A Dictionary of Earth Sciences. . Retrieved August 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/hale-bopp