Milestones

discovered. A possible new planet, as yet unnamed; by scientists at Caltech, Yale and the Gemini Observatory. The researchers said the ball of rock and ice is the first object larger than Pluto to be found in the outer reaches of the solar system.

won. lance armstrong, 33, in his last professional competition; a record seventh consecutive Tour de France; by 4 min. 40 sec. over Ivan Basso of Italy; in Paris. Of the race that defined his career, the world champion, who announced his planned retirement in April, said, "Vive le Tour,...

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