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Sackler Lecture in Astronomy

A glistening spaceship, with seven lonely years and billions of miles behind it, glides into orbit around a softly-hued, ringed planet. A flying-saucer shaped machine descends through a hazy atmosphere and lands on the surface of an alien moon, ten times farther from the Sun than the Earth. Fantastic though they seem, these visions are not a dream. For seven years, the Cassini spacecraft and its…