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More Moons Around Earth? Its Not So Loony By Robin LloydSenior Science Writer29 October 1999 Earth has a second moon, of sorts, and could have many others, according to three astronomers who did calculations to describe orbital motions at gravitational balance points in space that temporarily pull asteroids into bizarre orbits near our planet.The 3-mile-wide (5-km) satellite, which takes 770 years to complete a horseshoe-shaped orbit around Earth, is called Cruithne and will remain in a suspended state around Earth for at least 5,000 years. Cruithne, discovered in 1986, and then found in 1997 to have a highly eccentric orbit, cannot be seen by the naked eye, but scientists working at Queen Mary and Westfield College in London were intrigued enough with its peregrinations to come up with mathematical models to describe its path.
Quick simple answers1 The moon is made of rock quite similar to a lot of the rocks on the earth we have samples of it from the moon missions and meteroites2 we have only one moon because it is a big one and it would disturb any other moons that tried to join our system and throw them back out into space