NASA successfully launched its twin GRAIL lunar probes yesterday. The goal of GRAIL will be to conduct the most sophisticated study of the interior structure of the Moon yet attempted. Scientists think that understanding the Moon inside out will help them to understand the evolution of rocky planets generally.
The two probes will work together to map the Moon's gravitational field. They will constantly exchange signals while in lunar orbit, and by studying the variations in those signals, scientists will be able to see fluctuations in lunar gravity, which they then will be able to relate to the Moon's interior structure-- one of several techniques to be used.
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