Space: Return to Mars

How NASA plans to use its two rovers to roam the Red Planet looking for signs of Martian life

It's a safe bet the herd of deer that wandered onto the grounds of NASA's Jet Propulsion Laboratory (J.P.L.) in Pasadena, Calif., last week had no idea what was going on when a team of scientists burst into a courtyard, cheering and high-fiving over the successful landing of the Spirit rover on the surface of Mars. If the deer wander back this week, they could see more of the same, that is if Spirit--which has been operating splendidly but has not yet budged from the safety of its landing platform--at last rolls cautiously down onto the red Martian soil, preparing for...

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