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ALSEPApollo Lunar Surface Experiments Package
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On their first excursion, the astronauts set up the Apollo Lunar Surface Experiment Package, or ALSEP, which sent data back to Earth for seven years after Apollo 12's return.
Like their predecessors, the astronauts would deploy ALSEP scientific stations to probe the Moon's environment and interior after they departed.
Their scientific haul -- 110 kg of samples, thousands of photographs, and ALSEP data -- brought Appollo to a spectacular, if premature, end.