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In January 2004, Spirit and Opportunity, two identical robotic rovers, entered the
martian atmosphere and landed after a seven-month journey from Earth. As of this
writing in November 2004, both sojourners have explored their respective landing
areas for 10 months, making one intriguing discovery after another, and they are
still going strong despite creeping signs of old age. Here, learn more about this
hardy pair of robotic geologists and their sophisticated scientific instruments.
To launch the interactive, click on the image at left.—Lexi Krock
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