A planet is a large, round object in space that orbits a star, like Earth or Mars.
From Greek 'planētēs' meaning 'wanderer', from 'planasthai' meaning 'to wander'. To ancient sky-watchers, planets looked like stars that wandered across the sky instead of staying fixed.
To the ancients, planets were simply 'wandering stars' that refused to stay in line with the others. Now we know each of those wanderers is a whole world, some with more moons and mountains than we can easily imagine.
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