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Comets
Part 1 of Paper
....lled 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 data. For one, of the observed gases and
meteoric particles that are ejecte.... Part 2 of Paper
.... 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 by 2.5 mi) in size.
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| Number of words: 275 - Approximate pages: 1 |
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