Aliens need gold. Lots and lots of gold. The theory comes from the 1976 book The "12th Planet" by Zecharia Sitchin who, in addition to apparently considering the Sun and Moon planets, is a self-proclaimed scholar of ancient astronauts and Sumerian texts. It goes something like this...
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Sun and Moon
StrayLite 44 weeks 1 day 8 hours 8 min ago
The theory is far-fetched but the part about the Sun and Moon being planets is not.
Actually the word planet means "wanderer." It comes from the Greek term "astera planetai" which means "bright lights that wander in the sky" and were so named because they appeared to move relative to the "fixed stars" in the night sky. The Sun and Moon were indeed "planetai" in that sense -- modern astronomical science merely modified the ancient definition so I would not be so quick to poo-poo the idea that the SUn and Moon are planets. They are planets from a certain perspective.