Precambrian The leading theory of the Moon's origin is the giant impact theory, which postulates that Earth was once hit by a planetoid the size of Mars; such a theory is able to explain the size and composition of the Moon, something not done by other theories of lunar formation.
Precambrian The leading theory of the Moon's origin is the giant impact theory which postulates that Earth was once hit by a planetoid the size of Mars; such a theory is able to explain the size and composition of the Moon something not done by other theories of lunar formation