The Japanese Hiten spacecraft visited this object in 1990, and the Chinese Chang'e system is looking for helium-3 on this object.  The largest impact crater in the Solar System, the South Pole-Aitken basin, is also the point of lowest elevation on this object, which was photographed by the Clementine craft.  Oceanus Procellarum is notable feature on this object that does not contain any impact craters.  Most US space missions to this object lande
The Japanese Hiten spacecraft visited this object in 1990, and the Chinese Chang'e system is looking for helium-3 on this object.  The largest impact crater in the Solar System, the South Pole-Aitken basin, is also the point of lowest elevation on this object, which was photographed by the Clementine craft.  Oceanus Procellarum is notable feature on this object that does not contain any impact craters.  Most US space missions to this object landed in the Sea of Tranquility, one of its namesake maria.  FTP, name this celestial object which causes tides and revolves around the Earth.
The Japanese Hiten spacecraft visited this object in 1990, and the Chinese Chang'e system is looking for helium-3 on this object.  
Moon