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A Liquid-Filled Moon?

“Using seismic analysis tools developed for probing Earth, scientists took another look at data collected by four sensors positioned on the lunar surface by NASA astronauts during the 1969-1972 Apollo moon program.

The Apollo Passive Seismic Experiment recorded motions of the ground from moonquakes and other activities generating sound waves until late 1977. The network was too limited to directly monitor waves bouncing off or scattered by the moon’s core, leaving scientists dependent on more indirect techniques, such as measuring minute gravitational changes, to craft a picture of the moon’s interior.

Those models turned out to be pretty accurate, says lead scientist Renee Weber, with NASA’s Marshall Space Flight Center in Huntsville, Ala.

The new research confirms the existence of a solid inner core and liquid outer layer, similar to Earth’s. Unlike Earth, the moon also has a partly melted, mushy layer over that.”

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