Astronomers focussed on the large dark basin toward the lunar north pole called Mare Frigoris

Astronomers focussed on the large dark basin toward the lunar north pole called Mare Frigoris
Heavy methane downpours produce erosive features similar to those found on Earth
Data from the Dawn spacecraft suggests the world’s interior is the source, as opposed to arriving via impacting asteroids or comets
Three super-Earths and a “small Saturn” have been found relatively close to us