The picture above is of the famous Buzz Aldrin on the moon with the lunar seismometer. This is because moonquakes happen, but their cause is unknown. For instance, from 1972 to 1977, 28 moonquakes occured. Since there are no tectonic plates on the moon, their source is from something else, however scientists still have not discovered the root of them. It also seems, as detected from the seismomter, that moonquakes are often more powerful than earthquakes, elapsing for several minutes at a time.
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