Spirit's Journey to the Center of Mars

Mars rover Spirit has tenaciously swept, scraped, and squeezed secrets from the forbidding surface of Mars for 6 years. Now at an impasse, up to its belly in sand, it has struggled to tilt its solar panels toward the sun and collect just enough power to survive the perilously cold Martian winter. If Spirit can make it through to spring, the feisty robot will prove it's still in the game--by solving the mysteries of the Martian core.

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