posted on Jul, 6 2022 @ 08:01 AM
a reply to: OneBigMonkeyToo
The Apollo 11 Seismograph only lasted a month before went dark - probably from overheating during lunar "day"
Later seismographs used a different design to avoid this problem
Were powered by nuclear generator using decay heat from plutonium 238 to run thermionic system to convert heat to electricity
Plutonium 238 has half life of 5 year so in the 50 years since be left on moon the plutonium heat source would have decayed to nothing
Data was received from 1969 to 1977