We've walked on the Moon, driven rovers across its surface, and analysed every gram of rock the Apollo astronauts brought home, yet we still don't have a complete picture of what the Moon is actually made of. Now a team of researchers in Japan think they've found the answer, a compact X-ray telescope, small enough to sit on a single satellite, that could map the entire lunar surface in just two years. It's an elegant solution to one of planetary science's most stubborn problems and the implications for understanding where the Moon came from could be revolutionary.
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