I UNDERSTAND how exponential stuff works: A MAC round IS NOT as effective as a NUKE; an ASTEROID is 500x EXPONENTIALLY STRONGER than a NUKE of SAME YEILD. As far as planets go guess what: E=mc^2 As long as you have EQUAL force of ENERGY OR MASS to the resistive force of an ENTIRE PLANET: [b][i][u]there are then an INFINITE number of ways to destroy that planet so long as you use the energy that is required[/u][/i][/b] We can accurately MEASURE the earth's mass down to a phemta gram! (Idk spelling but its a few THOUSAND times smaller than a gram!) We can also just as accurately measure the density of that mass That being said while actual 100% composition STILL alludes us; we have ENOUGH of the equation to calculate the destructive force required.