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- Mars (27704 bytes)
8: ... a quarter the surface area of the [[Earth]] and only one-tenth the [[mass]] (though its surface area ...
11: ... is thin: the [[air pressure]] on the surface is only 750 [[pascal]]s, about 0.75 percent of the avera...
22: ... mineral [[goethite]], which (unlike hematite) ''only'' forms in the presence of water, along with oth...
31: ...[[Mount Everest]] and the [[Mariana Trench]]) is only 19.7 km. Combined with the planets' different ra...
44: ... belief by some that life existed on Mars, due mainly to observations by [[Percival Lowell]] of [[Mart...
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