[Telepathic Intruder]

A “ploonet” would also meet the qualifications for being a “dwarf planet”. Why do we need two terms, and how can you tell for certain that a dwarf planet is not actually a former moon? Pluto could be a former moon for all we know. So could Ceres.

[Lurker51]

Precisely my first thought.

[null and void]

Pluto could be a former moon for all we know. So could Ceres.

So could we.

[PIF]

A “ploonet” would also meet the qualifications for being a “dwarf planet”. Why do we need two terms, and how can you tell for certain that a dwarf planet is not actually a former moon? Pluto could be a former moon for all we know. So could Ceres.

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Why stop there? Earth, Venus, Mars, and Mercury could a be escaped moons of Saturn, cf David Talbot’s “Saturn Myth”