Last Updated
：2025/12/03
Planet 9
Proper noun
Japanese Meaning
太陽系内に存在する可能性が提唱されている理論上の第9惑星。カイパーベルト外縁を主に公転する一群のトランスネプチューン天体の軌道配置の説明に用いられる。
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(astronomy) A theoretical ninth planet in the Solar system, the gravitational effects of which would explain the improbable orbital configuration of a group of trans-Neptunian objects that orbit mostly beyond the Kuiper belt.
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Planet 9
Astronomers proposed Planet 9 to explain the unusually clustered orbits of several trans-Neptunian objects beyond the Kuiper Belt.
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Astronomers proposed Planet 9 to explain the unusually clustered orbits of several trans-Neptunian objects beyond the Kuiper Belt.
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