The story
From secondary + planet from being the planet of a planet (a satellite of a planet).
Etymology from Wiktionary, CC BY-SA 4.0.
secondary planet
Today it means: A moon of a planet. Full definition →
Today it means: A moon of a planet. Full definition →
From secondary + planet from being the planet of a planet (a satellite of a planet).
Etymology from Wiktionary, CC BY-SA 4.0.