You know it's a good plan if it requires someone to act as bait.
And hey, the more, the merrier!
GM: R2, you've analysed the plans you downloaded from the Peace Moon. Here's what you find.
R2-D2: Hmmm. As I suspected, they're powering the entire Moon with the Lost Orb.
R2-D2: It's the only way they could conceivably get enough energy to blow up a planet.
Han: How's it connected?
R2-D2: Looks like the power is all being channelled through conduits on either side of the Orb.
Han: Hmmm. If they're drawing off enough power to destroy a planet, and the Orb gets bumped, it could be catastrophic.
Luke: That's it! That's how we destroy the Moon!
R2-D2: Destroy it?
Han: Yeah, yeah! We give them another planet to blow up. Then just as they're powering up the superlaser—
Luke: We fire a proton torpedo into this thermal exhaust port! Kaboom!
C-3PO: Wait wait wait... "We give them another planet to blow up"?
Han: Or a heavily populated moon would do.