File:Terrestrial planet size comparisons edit.jpg

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The terrestrial planets, from left to right: Mercury, Venus, Earth, and Mars.

A terrestrial planet is a planet that is primarily composed of silicate rocks. The term is derived from the Latin word for Earth, "Terra", so an alternate 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. Terrestrial planets all have roughly the same structure: a central metallic core, mostly iron, with a surrounding silicate mantle. Terrestrial planets have canyons, craters, mountains, volcanoes and secondary atmospheres.
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Author Jack · talk ·
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Other versions Image:Terrestrial planet size comparisons.jpg / Image:Terestial planets comparisons.jpg

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current13:09, 14 February 2007Thumbnail for version as of 13:09, 14 February 20074,500 × 1,971 (680 KB)Jrockley (talk | contribs){{Information| |Description= The '''terrestrial planets''', from left to right: Mercury, Venus, Earth, and Mars. A terrestrial planet is a planet that is primarily composed of silicate rocks. The term is derived

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