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Science 28 March 2008:
Vol. 319. no. 5871, p. 1765
DOI: 10.1126/science.1155743
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Policy Forum

PLANETARY SCIENCE:
The Planet Debate Continues

Mark V. Sykes

The IAU decisions a year ago to define "planet" narrowly and to demote Pluto have not been universally accepted.

Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, AZ 85719, USA. E-mail: sykes{at}psi.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)