standard stories about the formation and existence are boring, but here's an interesting one. did you guys know about NASA's attempt to collide Apollo 12 into the moon, and to study the geological effect on it? (seismic activity)
Well it produced stunning results, after surveying seismic activity of the moon after the impact, they reported that the moon vibrated and "rang like a bell" for at least an hour.
this happened sometime in the 1970s i belie.ve
edit:
this caused speculation that the moon could be hollow, or have a unique structure.
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