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Comets
Beginning of paper
A comet is generally considered to consist of a small, sharp nucleus
embedded in a nebulous disk called the coma. American astronomer Fred L. Whipple
proposed in 1949 that the nucleus, containing practically all the mass of the
comet, is a “dirty snowball” conglomerate of ices and dust. Major proofs of the
snowball theory rest on various .... Middle of paper
.... fade very slowly with time, as
would be expected of the kind of structure proposed by Whipple. Finally, the
existence of comet groups shows that cometary nuclei are fairly solid units. The
head of a comet, including the hazy coma, may exceed the planet Jupiter in size.
The solid portion of most comets, however, is equivalent to only a few cubic
kilometers. The dust-blackened nucleus of Halley's comet, for example, is about
15 by 4 km (about 9 b ....
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Number of words: 275
Number of pages: 1 (approx. 250 words per double-spaced page)
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