Lunar pemafrost: dielectric identification.
A simulator of lunar permafrost at 100 degrees K exhibits a dielectric relaxation centered at approximately 300 hertz. If permafrost exists in the moon between 100 degrees and 213 degrees K it should present a relaxation peak at approximately 300 hertz. For temperatures up to 263 degrees K it may go up to 20 kilohertz.
Alvarez
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