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How many times were things crashed into the Moon "for science" (seismic events)?

This answer to Did Apollo 13 produce any scientific results? begins: In addition to crashing the Saturn V's S-IVB into the moon to collect seismic data from sensors installed by the crews of Apollo ...
uhoh's user avatar
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5 votes
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Is deformation of the impact attenuation system visible on the surviving Apollo command modules?

As pointed out in this question, the Apollo command module had crushable ribs along one edge of the base of the cone, and crushable struts that suspended the crew couches inside the vehicle. I've ...
DrSheldon's user avatar
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