Humanity has long imagined leaving Earth and establishing a second home among the stars. The idea of a backup planet is no longer confined to science fiction, especially...
MSN New, Earth
A Planet Hit Earth 4.5 Billion Years Ago, and Its Remains Could Be Buried Deep Below Us
Billions of years ago, another planet smashed into Earth. An event of this epicness could have created our Moon. It also could have brought alien life to our planet...
