More generally, a meteorite on the surface of any celestial body is a natural object that has come from outer space. Meteorites have been found on the moon[1][2] and Mars.[3] Meteorites that are recovered after being observed as they transit the atmosphere or impact the Earth are called meteorite fall. All other meteorites are known as finds. As of February 2010, there are approximately 1,086 witnessed falls having specimens in the world's collections. There are more than 38,660 well-documented meteorite finds.[4]