These lunar mares (Latin for “seas”) of the Moon’s nearside make up the famous ‘man in the Moon’. ‘Giant impact’ theoryWas there once an asteroid or a young dwarf planet in orbit around the Sun on a collision course with the Moon? "The detailed gravity data obtained by GRAIL has given new insight into the structure of the lunar crust underneath the surface," said Zhu. NASA/JPL-CalTech/UCLA/MPS/DLR/IDAHow big was the dwarf planet? That’s slightly smaller than dwarf planet Ceres.

Source: Forbes May 21, 2019 17:58 UTC