Comets

Essay specific features

 

Issue:

Science

 

Written by:

Laura G

 

Date added:

September 4, 2010

 

Level:

University

 

Grade:

A

 

No of pages / words:

9 / 2287

 

Was viewed:

6597 times

 

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Essay content:

The nucleus is pretty solid and stable, composed mostly of ice and gas with a small amount of dust and other solids. The surface of the nucleus is best described as a black crust. Comet nuclei can range from 1 kilometer to about 50 kilometers across. The black crust on the surface of the nuclei helps the comet to absorb heat, which causes some of the ices under the crust to turn to a gas...
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Pressure builds up underneath the crust and causes the surface to bubble up in some places. Eventually, the weak spots of the crust break open from the pressure, and the gas shoots outward; astronomers refer this to as a jet. Dust that had been mixed in with the gas is also pushed out, and as more jets appear, a small gas and dust shell forms around the nucleus, and this is called the coma...
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