View Single Post
Old 12-26-2017, 04:15 PM
SamuelA is offline
Join Date: Feb 2017
Posts: 3,903
Originally Posted by Shodan View Post
SamuelA, if conservation of momentum is all you need to know about deflecting asteroids with nuclear weapons, why can't you move a fog bank with a bullet?

If the bullets are on the scale of the droplets of fog, and the fog bank is in a vacuum and not being pushed by wind, you can. You can also move a 10 kilometer diffuse collection of rocks with a really big bullet.

The reason the bullet passes through the fog bank is that it weighs a lot more and is a lot more dense than the droplets. A 10 kilometer asteroid with the gas pushed by a few megatons of nuclear warhead is nothing like your analogy.