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It is because the word planet is taken from the ancient greek word: planētēs. It means wanderer, which is what the planets do. They wander through the sky, not following the same path the stars take.

oh look, kerriknox is back giving you upvotes.

Don't be so jealous of good content. :-)

circle jerk.

Dude, just post something good for a change, someone will upvote it. :-)