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Riddles on Titan

Two puzzles have emerged from the Cassini spacecraft's first close flyby of Saturn's hydrocarbon-shrouded moon Titan (SN: 11/06/04, p. 291: Available to subscribers at Titanic Close-up: Cassini eyes Saturn's big moon). Radar images from the Oct. 26 passage, which recorded just 1 percent of the moon's surface, show no obvious sign of craters. That's a surprise because Titan, the solar system's second-largest moon after Jupiter's Ganymede, is likely to have been pummeled by debris roaming the outer solar system.

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