"Just like the Moon raises tides on the Earth, the Earth (and Sun) raise tides on the Moon," reads the study, published last month in the journal AGU Advances.
"Only models with a softer layer at the bottom of the mantle match all our measurements," reads the study, underscoring the significance of the partial melt layer for their conclusions.
"Such a soft layer, often thought to be partial melt, needs to be maintained," raising questions about the thermal dynamics that keep this goo-like layer functional.
The researchers describe their findings as the "first measurement of the Moon's yearly gravity changes due to tides," indicating a breakthrough in lunar science.
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