PASSIVE
SEISMIC EXPERIMENT
This device contained four seismometers powered by two panels of solar cells,
which converted solar energy into electricity. The experiment measured lunar
shock waves caused by moonquakes or impacts of meteoroids or of manmade
objects on the surface. Data regarding the strength, duration, and approximate
direction of the seismic event were relayed to receiving stations on Earth.
The seismic instrument package continued sending data for about a month
after the Apollo 11 landing.The seismic experiments left on the surface
by the crews of Apollo 11 and five later Apollo missions continued to return
valuable information even after the end of the Moon landings; the last one
was shut off in 1981.
Apollo 11 astronaut Aldrin
stands just to the side of the passive seismic experiment just
after completing deployment of the instrument. The LRRR may be seen in front
of Aldrin.
  Solar
Wind Composition Experiment
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