Comets

Essay specific features

 

Issue:

Science

 

Written by:

Eric K

 

Date added:

December 10, 2016

 

Level:

University

 

Grade:

A

 

No of pages / words:

1 / 278

 

Was viewed:

2627 times

 

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Essay content:

For one, of the observed gases and meteoric particles that are ejected to provide the coma and tails of comets, most of the gases are fragmentary molecules, or radicals, of the most common elements in space: hydrogen, carbon, nitrogen, and oxygen. The radicals, for example, of CH, NH, and OH may be broken away from the stable molecules CH4 (methane), NH3 (ammonia), and H2O (water), which may exist as ices or more complex, very cold compounds in the nucleus...
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Another fact in support of the snowball theory is that the best-observed comets move in orbits that deviate significantly from Newtonian gravitational motion. This provides clear evidence that the escaping gases produce a jet action, propelling the nucleus of a comet slightly away from its otherwise predictable path...
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