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...but only at the poles. Water was further confirmed by NASA's LCROSS lunar impact mission and India’s Chandrayaan-I lunar orbiter radar. The estimate of l ...s swept back together to form the Moon. This is called the "giant impactor hypothesis".

...anics]]. With his new system of calculations, Lagrange’s work led him to [[hypothesis|hypothesize]] how a third body of negligible mass would orbit around two la * The [[giant impact hypothesis]] suggests that an object named [[Theia (planet)|Theia]] formed at L<sub>4<