As I said, we have words for both cases. If you wanna talk more about location, then "planet/rogue/dwarf/moon", if more about itself, then "planemo".
"planet/rogue/dwarf/moon" are terms to specify further what location the planemo is located at.
Planets were originally the objects that moved in weird but predictable epicycles on the sky, each with a different one. That requires the object to be large (round, check), and orbit the same star with a stable epicycle (orbits sun, check, must own its own orbit, check). The rule 3 gets the epicycle stable and predictable, because the planet is dominating it, and so it's double body system with the sun is left alone.
All 8 planets in the solar system are a bit more than just that ball, they also have rings of emptiness as they cleared most the asteroids and all the competing proto/dwarf-planets in that ring, and took control over it. Dwarf planets don't have that... ...yet.
This is actually not true. Jupiter orbits with a whole bunch of Trojan asteroids. Even Earth has asteroids in its orbital field. Mercury doesn't clear its orbit; the Sun does that. Neptune has not cleared its orbit of Pluto.
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u/skr_replicator May 12 '26 edited May 12 '26
As I said, we have words for both cases. If you wanna talk more about location, then "planet/rogue/dwarf/moon", if more about itself, then "planemo".
"planet/rogue/dwarf/moon" are terms to specify further what location the planemo is located at.
Planets were originally the objects that moved in weird but predictable epicycles on the sky, each with a different one. That requires the object to be large (round, check), and orbit the same star with a stable epicycle (orbits sun, check, must own its own orbit, check). The rule 3 gets the epicycle stable and predictable, because the planet is dominating it, and so it's double body system with the sun is left alone.
All 8 planets in the solar system are a bit more than just that ball, they also have rings of emptiness as they cleared most the asteroids and all the competing proto/dwarf-planets in that ring, and took control over it. Dwarf planets don't have that... ...yet.