Science: A Postcard from Mars

Like tourists everywhere, the two Viking landers and their orbiters have spent much of the 15 months since their arrival on Mars snapping pictures of the Red Planet. The latest batch includes the best and most revealing shots yet. Among the pictures released by NASA: a photomosaic of the planet's north pole, showing a concentric pattern of striations in the ice cap; a color snapshot showing newly formed frost on the ground near the feet of the dust-covered Viking 2 lander; and a photo proving that something—wind, a tremor, a frost heave—has caused...

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