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褐色矮星

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The planetary-mass moons to scale, compared with Mercury, Venus, Earth, Mars, and Pluto (the other planetary-mass objects beyond Neptune have never been imaged up close). Borderline Proteus and Nereid (about the same size as round Mimas) have been included. Unimaged Dysnomia (intermediate in size between Tethys and Enceladus) is not shown; it is in any case probably not a solid body.[1]

惑星質量天体（PMO）とは？定義から多様な分類までを解説

惑星質量天体PMO静水圧平衡準褐色矮星
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天体の内部加熱宇宙を動かすエネルギー源のメカニズム

内部加熱天文学重力収縮核融合
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