In the latest bit of remarkable fortune on Mars, the rover Opportunity discovered that the only big rock in its neighborhood is the cousin, if not the brother, of a famous Martian meteorite found on Earth. The finding is all the more special because the rock is itself rare on Mars. The discovery is one of the first treats in the five-month extended mission that was recently approved by NASA headquarters (AW&ST Apr. 12, p. 53). It runs until mid-September, when the Sun comes between ...


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