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25 years ago today, NASA's Lunar Prospector spacecraft was successfully launched, and went on to orbit the Moon for almost 19 months to map its surface composition and to look for polar ice. This image from Lunar Prospector data shows thorium concentrations on the Moon's surface.
#NASAhistory
#NASAhistory
in reply to NASA

Buster McNutt
Buster McNutt
• •
What methods were used to map composition? Are there maps for all the other elements?
in reply to NASA

Simon Dodd
Simon Dodd
• •
Am I wrong to interpret that image as showing a very large deposit from a very large impactor and a smaller deposit from one or more smaller impactors, with little or no native thorium?

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