Moon 月球

Earth had Two Moons Until They Collided: Claim Scientists [Photos]
http://www.ibtimes.com/articles/192090/20110804/two-moons-earth-orbit-lunar-body-collision-merged-nature-nasa-sister-satellite-scientist-researchers.htm
Two Moons’ Collision Resulted in One Moon for Planet Earth [VIDEO & PHOTOS]
http://www.ibtimes.com/articles/192601/20110804/two-moons-collision-resulted-in-one-for-planet-earth.htm