Clutching three black-and-white photographs, Marty Tomasko beamed as he strode into a late-night press briefing on Jan. 14 in Darmstadt, Germany. With a crowd gathering around him at the European Space Agency’s operation center, he showed off images taken by the Huygens probe, which just hours before had landed on Saturn’s moon Titan. No other humanmade object had ever touched such distant ground.
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