The Moon's face is an open book, but its deeper nature is still a mystery. Probes from Europe, Japan, India, China and the United States have imaged the lunar surface in exquisite detail, mapped its minerals, looked for evidence of water and scouted for potential landing sites. Now Maria Zuber, principal investigator for NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission, which is set to launch on 8 September, wants to reveal the Moon's hidden history.
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