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Four geophones connected by cables to the central station of the ALSEP were set up to record the seismic waves created by the launch of the LM, the detonation of the explosives, and any moonquakes or meteorite impacts. @NASAMoon
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#NASAhistory
in reply to NASA

Joe Calhoun
Joe Calhoun
• •
Surely that would be “four lunaphones”??

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