Lunar Prospector
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A NASA spacecraft that orbited the moon, used a gamma-ray spectrometer to find a hotspot on the far side of the moon that emitted a lot of gamma rays.
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Videos Mentioning Lunar Prospector

Unidentifiable stellar object stumps astrophysicists
Sabine Hossenfelder
A NASA spacecraft that orbited the moon, used a gamma-ray spectrometer to find a hotspot on the far side of the moon that emitted a lot of gamma rays.

The Lunar Database: Supporting Lunar Landing Site Selection for NASA's Return
GoogleTalksArchive
A 1997 NASA Ames mission that did not carry a visual camera but used spectrometers to detect potential water ice signatures at the poles.