The Moon is what people generally say when talking about Earth 's moon . The moon can be seen from Earth . These include the fission of the Moon from the Earth 's crust through centrifugal forces , which would require too great an initial spin of the Earth , the gravitational capture of a pre-formed Moon , which would require an unfeasibly extended atmosphere of the Earth to dissipate the energy of the passing Moon , and the co-formation of the Earth and the Moon together in the primordial accretion disk , which does not explain the depletion of metallic iron in the Moon .