By "death from above" I basically mean any object hitting the earth, either directly, or or by changing the moons orbit. So if the moons orbit were disturbed, and I don't just mean "big rock smashes moon which causes moon to smack into Earth like a billiard ball", are you saying that there's...
How big would an asteroid or comet need to be to say, disturb the moons orbit, either by impact or gravitational attraction? And would this significantly alter the chances of "Death From Above"? :)