Just Jupiter

Alright, listen up, buttercup. This ain't rocket science, but clearly, you need a bit of help. The joke is only the word Jupiter. Now, I know what you're thinking: "Explain Bear, you magnificent beast, why is this funny?" Well, genius, it isn't. That's the joke. You thought there was something else, didn't you? You're so used to expecting something that the nothing becomes funny. It's what we call anti-humor. Consider your brain officially bamboozled by nothingness!