Before revision: Earth–Moon system Moon Earth and the Moon as seen from Mars by the Mars Reconnaissance Orbiter The Moon is a relatively large, terrestrial, planet-like natural satellite, with a diameter about one-quarter of Earth's.
After revision: Earth–Moon system Moon Earth and the Moon (roughly to scale), taken from orbit aroundA photograph of Mars by the Mars Reconnaissance Orbiter The Moon is a relatively large, terrestrial, planet-like natural satellite, with a diameter about one-quarter of Earth's.