Why Have We Not Been Visited?

Conceivably, for better or for worse,
Earth bears the only life in the universe.
Or life is likely, but intelligence
is far too rare in even this immense
creation. Or, perhaps, ginormous rocks
strike worlds so often, they turn back the clocks.
But I think they have simply overlooked us.
Quite fortunate, since they’d have quickly cooked us!

___

(Appeared in The Asses of Parnassus.)