Sol IX

Proper noun

dated

(astronomy, dated) An alternate name for the dwarf planet Pluto.

Japanese Meaning

（天文学用語で、時代遅れの呼称）冥王星の別名

Despite its remote orbit, Sol IX continues to fascinate astronomers with its complex geology and tiny moons.

その遠い軌道にもかかわらず、冥王星は複雑な地質と小さな衛星で天文学者を魅了し続けている。

Sense（1）

(astronomy, dated) An alternate name for the dwarf planet Pluto.