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Mars' Columbia Hills

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. Spirit 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.

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