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Science 30 July 1999:
Vol. 285. no. 5428, pp. 649 - 650
DOI: 10.1126/science.285.5428.649a
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News of the Week

PLANETARY SCIENCE:
Telling Pluto and Its Partner Apart

Mark Sincell

Astronomers at Japan's Subaru Telescope on Mauna Kea, Hawaii, have added another compound, ethane, to the list of organic molecules detected on the solar system's coldest planet. The Subaru observations, released last week, also confirm that Pluto and its satellite Charon have very different compositions, suggesting that Charon formed in a tremendous interplanetary collision.

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