It's not as easy to destroy the Earth as you might think.We all know the world is heading for a violent end, but what's going to get us first?" Alltime10s looks at 10 possible scenarios that could completely wipe out life on planet Earth in what's decidedly not the most uplifting video you'll see today.In the vast majority of the cases, atmosphere causes a tremendous amount of friction that literally burns the meteorite (an asteroid becomes defined as a meteorite when it enters our atmosphere). The smaller an asteroid, the more numerous they are, is the general rule of thumb for our solar system. According to the best estimates, objects 3 meters across impact the Earth and deliver about 2 kilotons of TNT of energy. Objects 100 meters across collide with the Earth every few hundred years and deliver about 2 Megatons of TNT equivalent. A 1 kilometer-sized object impacts the Earth every million years or so and delivers about 100,000 Megatons of TNT.
