The earth and the moon are one substance. They're made by impacts as far as I'm aware.
here you go karlos http://phys.org/news/2012-07-potenti...xoplanets.html
If it were that simple we'd be living there already.
we are crab people
you should watch the tv show life after people
shows how long it would take for all proof of our existence to be wiped off the earth
its not a very long time either