Atoma is the planet on which the bad evil but disarmingly casual Tyrant lives. As with most science fiction, the entire planet has one (1) political system. As with 50s science-fiction, it has an science-type name, although “Atoma” is like “Earth,” in the sense that the planet is named after the material it’s made of. I always thought that calling this place “Earth” was like calling it “Dirt.”
He’s not the only one thinking that way. From the Hearth’s Warming Eve pageant, starring Pinkie Pie as Chancellor Puddinghead and Applejack as faithful secretary Smart Cookie:
Pinkie Pie: The air! The trees! The dirt! This dirt is the dirtiest dirt in the whole dirt world!
Applejack: And fertile, too. Perfect for growing food.
Pinkie Pie: In the name of the Earth ponies, I think I’m gonna call this new place … uh … Dirtville.
Applejack: How about “Earth”?
Pinkie Pie: Earth! Congratulations to me for thinking of it.
Don’t even think about Uranus.