Mars' red exterior is only skin deep

02/24/2013 | Space.com

NASA's Curiosity rover has discovered that under the surface, Mars is more gray than red. The rover dug 2.5 inches into the planet's surface and retrieved rock powder that "may preserve some indication of what iron was doing in these samples without the effect of some later oxidative process that would've rusted the rocks into this orange color that is sort of typical of Mars," said Joel Hurowitz of NASA's Jet Propulsion Laboratory.

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