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“Ask an Astronomer.” Cool Cosmos, coolcosmos.ipac.caltech.edu/ask/179-When-will-Halley-s-comet-return-.

Campbell, Ann-Jeanette, and Jessica Wolk-Stanley. The New York Public Library Amazing Space: a Book of Answers for Kids. Wiley, 1997.

"Halley's comet." World of Scientific Discovery, Gale, 2007. Research in Context, go.galegroup.com/ps/i.do?p=MSIC&sw=w&u=stou53589&v=2.1&it=r&id=GALE%7CCV1648500286&asid=c2c24c35c1cac5c104508c7d702908d3. Accessed 17 Nov. 2017.

“History - Historic Figures: Edmond Halley (1656 - 1742).” BBC, BBC, www.bbc.co.uk/history/historic_figures/halley_edmond.shtml.

“Nicole-Reine Etable De Labrière Lepaute.” Lepaute Biography, www-history.mcs.st-and.ac.uk/Biographies/Lepaute.html.

Wilford, John Noble. “SIR EDMUND HALLEY: ORBITING FOREVER IN NEWTON'S SHADOW.” The New York Times, The New York Times, 28 Oct. 1985, www.nytimes.com/1985/10/29/science/sir-edmund-halley-orbiting-forever-in-newton-s-shadow.html?pagewanted=all.

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Though Isaac Newton had shown that comets--like the planets--moved through space in orbits. This seemed to suggest an elliptical orbit. When the comet entered the systems orbit, It just kind of stuck in the orbit and has been going ever since.

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astronomers know that Halley's comet completes its long elliptical orbit in just over 76 years

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It has been in our solar system's inner orbit for over 2 thousand years.

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Sir Edmund Halley calculated in 1682 it would take 75-76 years to reach earth after it's appearance that year.  It was seen again in 1758, 1835, 1910, and 1986.The comet will be seen again in 2062

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The comet  first entered the inner solar system as early as 239 B.C. Appearance in 1066 is documented in the Bayeux Tapestry, 1301 appearance is recorded in a nativity painting by the Italian painter Giotto.

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WHAT ARE SOME FAMOUS SIGHTINGS OF THE COMET?

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WHAT ARE SOME FAMOUS SIGHTINGS OF THE COMET?

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If the comet were to land on earth something different would happen, in 1908 a comet was theorised to crash in the middle of a siberian forest in russia but it is not known if it was a comet or an asteroid, The space rock’s nucleus vaporized the atmosphere around it, but the tremors it created were detected.

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If the tail of the comet were to collide with earth the meteors in the comet's tail would create a meteor shower

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WOULD ANY PART OF THE COMET RUN INTO EARTH?

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WOULD ANY PART OF THE COMET RUN INTO EARTH?

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Alexis along with Lalande and Lepaute created last minute decision about the calculation of Halley's comet.

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Sir Edmund Halley went to Oxford College, there he was introduced to John Flamsteed. Halley was influenced to create a catalog of the southern Hemisphere's stars modeling after Flamsteed's book on northern stars. He is famous for calculating the math for 24 comets, one of the most famous ones is a comet know now as Halley's comet.

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Joseph Jérôme Lefrançois de Lalande history 

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Joseph Jérôme Lefrançois de Lalande history 

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Lalande was good friends with Nicole-Reine Lepaute's husband. He was studying to be come a lawyer when he realized he was fascinated by astrology. He used a empty room in the Lepute's house to make his observations. He became intrigued by Halley's comet and approached Clairaut and asked to help calculate the math for Halley's comet. They realized they need more people, so Lalande asked Nicole to help.

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WHO HELPED CALCULATE THE MATH FOR HALLEY'S COMET?

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WHO HELPED CALCULATE THE MATH FOR HALLEY'S COMET?

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Nicole-Reine was famous for working with Lalande on the calculations for Halley's comet. Lalande approached Alexis Clairaut wanting to help calculate the math for when Halley's comet will return. He then asked Nicole-Reine to help calculate knowing how much math it would take.