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Comets Posters & Charts
for science, social studies and literature curriculum resources.
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science > astronomy > COMETS < natural phenomena < weather
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Comets are small bodies of rock, dust and ice that orbit the sun in extreme elliptical trajectories, displaying a coma, or tail, that always points away from the sun.
Comets have orbital periods ranging from decades to millions of years.
Edmond Halley predicted the reappearance of the comet that popularly bears his name; it has been sighted since 1337, last seen in 1985, and its next predicted appearance is 2061.
American author and humorist Mark Twain, wrote in 1909, “I came in with Halley's Comet in 1835. It is coming again next year, and I expect to go out with it.”
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Wits University. "First ever evidence of a comet striking Earth." ScienceDaily, 8 Oct. 2013. Web. 10 Oct. 2013. |
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Sir Edmond Halley
b. 11-8-1656; London, England
d. 1-14-1742
Sir Edmond Halley was an astronomer, geophysicist, mathematician, meteorologist, and physicist. He is most noted for his prediction of the return of a comet in 1758, officially known as 1P/Halley, the most famous of the periodic comets (due to brightness and 75-76 year periodicity which was within the range of a human life span). Halley's mathematical work also contributed to actuarial science and history of demography.
Edmund Halley quotes ~
• “In the year 1456 ... a Comet was seen passing Retrograde between the Earth and the sun... Hence I dare venture to foretell, that it will return again in the year 1758.”
• “This sight... is by far the noblest astronomy affords.”
• “Aristotle's opinion... that comets were nothing else than sublunary vapors or airy meteors... prevailed so far amongst the Greeks, that this sublimest part of astronomy lay altogether neglected; since none could think it worthwhile to observe, and to give an account of the wandering and uncertain paths of vapours floating in the Ether.”
• Edmond Halley: Charting the Heavens and the Seas
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Comet Hyakutake is a comet discovered by the Japanese amateur astronomer Yuji Hyakutake. The comet was visible to the naked eye throughout much of the world in the Spring of 1996, the orbital period of comet Hyakutake is about 29,500 years.
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Comet Shoemaker–Levy 9 broke apart and collided with Jupiter in July 1994, providing the first direct observation of an extraterrestrial collision of Solar System objects.
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