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Astronomers debated whether Pluto and Charon should be classified as a double planet because Charon's mass makes up a substantial portion of the system's overall mass.
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Astronomers debated whether Pluto and Charon should be classified as a double planet because Charon's mass makes up a substantial portion of the system's overall mass.
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Related words
double planet
Noun
Japanese Meaning
主惑星が存在するが、その衛星が、単独で惑星とみなされるほどの大きさ・質量を持ち、系全体の質量の大部分を占める天体システム（いわゆる二重惑星） / 二重惑星：惑星とその巨大な衛星が互いに重力で結ばれ、ほぼ互角の関係にあるため、両者を合わせたシステムが全体として惑星の性質を示す天体
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