planet = πλανήτης [planitis] from πλανήτης αστήρ [astir] = wandering star.
From πλανάσθαι [planasthae] = "to wander". So called because they have apparent motion, unlike the "fixed" stars. Originally including also the moon and sun.
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The Greeks did not know about any but the first 6 planets (if you include Earth). Here however are the names for the planets they did know about:
The planets were actually named after the Greek gods in their Roman form. For example, some of the planets were Jupiter (Zeus), Pluto (Hades), Mars (Ares), Mercury (Hermes), Venus (Aphrodite), Saturn (Demeter), Neptune (Poseidon, and Ouranos (Uranus). Earth is the only planet that is not named after a Greek/Roman god or goddess
Yes the word planet was originally called wanderer in the Greek language.
The word comes from ancient Greek planetes, meaning wanderer.
Planet Green was created in 1998.
The Welsh word for planet is 'planed' (plural - planedau)
The plural for of the word planet is the word planets.