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Mars' Columbia Hills

Sulfur-rich rocks in the "Columbia Hills" on Mars stand out in bright blue in this false-color image from the Spirit rover. Sprit used its rock abrasion tool, or "RAT" to grind a hole in the rock, nicknamed "Peace" in honor of Dr. Martin Luther King, Jr. The rock's high sulfur content and softness are probably evidence of past alteration by water.

Image Credit: NASA/JPL/Cornell

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