File:Terrestrial planet size comparisons.jpg

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Summary

Size comparison of inner planets (left to right): Mercury, Venus, Earth and Mars

This diagram shows the approximate relative sizes of the terrestrial planets, from left to right: Mercury, Venus, Earth and Mars. Distances are not to scale. 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.

Description= The inner planets, from left to right: en:Mercury, en:Venus, en:Earth, and en:Mars Source: http://solarsystem.nasa.gov/multimedia/gallery/terr_sizes.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:10, 27 July 2010		1,500×653 (456 KB)	JBogdan (Talk | contribs)

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