Into_to_geo_2 - The Earth in Context cont Solar system cont The planets accreted from this nebula through gravitational attraction and haphazard

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The Earth in Context cont. Solar system cont. The planets accreted from this nebula through gravitational attraction and haphazard collisions Pluto , long considered the “ninth planet,” has recently seen its status demoted; astronomers now recognize only eight major planets in our Solar System. Pluto belongs to a group of icy and rocky bodies beyond Neptune’s orbit termed the Kuiper Belt, the origination site for numerous comets The terrestrial planets (Mercury, Venus, Earth, and Mars) are relatively small, dense, and rocky worlds because solar winds from the nearby Sun expelled most of the superabundant (but very light) elements, hydrogen and helium The gas giant planets (Jupiter, Saturn, Uranus, and Neptune) retained these elements and are thus much larger and much less dense (Saturn is less dense than water) Our Moon, responsible for Earth’s tides, has a composition similar to Earth’s mantle The Moon is thought to have originated from debris accumulated when a Mars-
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This note was uploaded on 04/08/2011 for the course GEOL 2001 taught by Professor Babaie during the Winter '09 term at University of Georgia Athens.

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Into_to_geo_2 - The Earth in Context cont Solar system cont The planets accreted from this nebula through gravitational attraction and haphazard

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