| http://www.w3.org/ns/prov#value | - Listen to this one-minute video clip to find out how astronomer Michael Brown knew immediately that the object he discovered in 2005 was a planet and that it was larger than Pluto. (QuickTime, RealVideo, or Windows Media plug-in required.) (Grades 3-5, 6-8, 9-12)Profile: Tyler Curiel Ask the Expert Send questions about surviving Katrina and salvaging his life's work to cancer researcher Tyler Curi
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