NOVA scienceNOW

10th Planet

Clip | 5m 28s  | Video has closed captioning.

A discovery in our solar system raises questions about what makes a planet a planet.

Aired: 01/01/06

Rating: TV-G

Problems Playing Video? | Closed Captioning

Funding for NOVA ScienceNOW is provided by the National Science Foundation and the Alfred P. Sloan Foundation.

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