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NASA's list of scientific investigations on the Moon just keeps on growing ahead of its ambitious plans to return astronauts to the lunar surface.
The space agency is trumpeting a new top priority: the exploration of puzzling geological features called the Gruithuisen Domes, two mysterious mounds of granite-like rock that scientists suspect were formed by silica-rich magma.
What makes them so unusual is the fact that this type of magma usually only forms on Earth in the presence of both water and volcanic activity caused by shifting tectonic plates - neither of which are present on the Moon.
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