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  1. 18946

    Pluto is distinguished by properties other than its size, and its representation in “Nine planets, or eight?” as just another gray ball was misleading. It has the most contrasting surface known in the solar system (bright nitrogen ice caps and dark carbonaceous equatorial areas). To understand the processes ongoing on Pluto’s surface and within its […]

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  2. Astronomy

    Nine Planets, or Eight?

    Astronomers probe Pluto's place in the solar system.

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  3. Robot Zoo

    The Robot Zoo Web site, developed by the Tech Museum of Innovation in San Jose, Calif., captures some of the charm of a traveling biomechanics exhibit featuring giant robot models of animals.