Jupiter, also known as "Dairy Planet" by its natives, is the fifth planet of the solar system and the largest. It is composed mostly of hydrogen.

Jupiter is the homeworld of the Jupertonians, as mentioned by ALF.

ALF also mentions that Jupertonians advertise Jupiter as the "dairy planet" on their license plates. This implies some creature or thing on Jupiter produces some sort of milk like substance that can be used in making of dairy products, but ALF doesn't go into any more detail.

On the episode The Gambler, Carl Buck, a set decorator for the movie Jupiter Guys, rents ALF's spaceship to use as a prop in the film.



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