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Charon (moon) : ウィキペディア英語版 | Charon (moon)
Charon, also called (134340) Pluto I,〔 is the largest of the five known moons of the dwarf planet Pluto. It was discovered in 1978 at the United States Naval Observatory in Washington, D.C., using photographic plates taken at the United States Naval Observatory Flagstaff Station (NOFS). It is a very large moon in comparison to its parent body, being half the diameter and one eighth the mass of Pluto. Its gravitational influence is such that the barycenter of the Pluto–Charon system lies outside Pluto. The ''New Horizons'' spacecraft flew through the Pluto system on 14 July 2015, approaching to within of Charon. It is to date the only probe to have visited and studied the moon. ==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Charon (moon)」の詳細全文を読む
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