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| Keywords: Terrestrial planet size comparisons edit.jpg 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 original http //solarsystem nasa gov/multimedia/gallery/terr_sizes jpg edited by tripling horivontal resolution and superimposing over the old globes the images en Image Reprocessed Mariner 10 image of Mercury jpg en Image Venus globe jpg en Image The Earth seen from Apollo 17 jpg en Image Mars Valles Marineris jpeg 2006-03-20 <font face Verdana >Jack <small>· talk · </small></font> Image Terrestrial planet size comparisons jpg / Image Terestial planets comparisons jpg Mercury size comparisons Venus size comparisons Mars size comparisons Earth size comparisons Terrestrial Planet The Blue Marble | ||||
