Terrestrial

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Terrestrial

A terrestrial planet, telluric planet or rocky planet is a planet that is primarily composed of silicate rocks. The terms are derived from Latin words for Earth (Terra and Tellus), so an alternative definition would be that these are planets which are, in some notable fashion, "Earth-like". Terrestrial planets are substantially different from Gas Giants, which might not have solid surfaces and are composed mostly of some combination of hydrogen, helium, and water existing in various physical states.

The free encyclopedia. (2004, July 22). FL: Wikimedia Foundation, Inc. Retrieved May 12, 2008, from http://en.wikipedia.org/wiki/Terrestrial_planet

--Xandramus 04:00, 12 May 2008 (CDT)