[qam1]

Luhman doesn't rule out the possibility that a planet is lurking somewhere in the asteroid belt.

Huh?

I think we can clearly rule out an undiscovered planet in the asteroid belt. Unless it's inhabited by shy aliens who built a large cloaking devise

[Talisker]

I think we can clearly rule out an undiscovered planet in the asteroid belt. Unless it's inhabited by shy aliens who built a large cloaking devise

But think about it - shy aliens are EXACTLY the ones who would build a cloaking device!