25/01/2004 Opportunity rover lands on surface of Mars
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Mars Rover: Opportunity | National Geographic
Mars Opportunity Rover
Mars seen by Opportunity rover [HD]
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It landed three weeks after its twin Spirit. The landing site was in Meridiani Planum. It is a plain which hosts a crystalline hematite. On Earth, hematite is often formed in hot springs or in standing pools of water. Some people therefore believe that there was liquid water on Meridiani Planum in the past.