There could be rain in the forecast on Titan-huge torrents of it, swelling rivers and filling seas. But nothing's likely to grow on the surface of that distant moon of Saturn. The temperature averages a brisk -290℉, and the rain is not water but liquid methane. Those are just some of the findings of the remarkable Huygens spacecraft, which landed on Titan two weeks ago. The probe took seven years to fly to the Saturnian system and lived, as planned, for only 70 min. on Titan's plains. But the data it radioed home in the eyeblink of its aetive life should keep investigators busy for years.
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