“Moon’s Two Faces” –Mystery Solved By Wayward Dwarf Planet Collision

Moon's Farside

 

The mystery of the stark difference between the Moon’s heavily-cratered farside and the lower-lying open basins of the Earth-facing nearside has puzzled scientists for decades began in the Apollo era with the first views of its farside. Measurements made by the Gravity Recovery and Interior Laboratory (GRAIL) mission in 2012 filled in more details about the structure of the Moon — including how its crust is thicker and includes an extra layer of material on its farside suggests the differences were caused by a wayward dwarf planet colliding with the Moon in the early history of the solar system.

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