This theory proposes that a small planet the size of Mars struck the Earth just after the formation of the solar system, ejecting large volumes of heated material from the outer layers of both objects. A disk of orbiting material was formed, and this matter eventually stuck together to form the Moon in orbit around the Earth. Credits: http://www.caedes.net/Zephir.cgi?lib=Caedes::Infopage&image=pom1-1133819807.jpg http://www.solarviews.com/raw/earth/earthafr.jpg http://www.noao.edu/image_gallery/images/d4/moon.jpg