ALSEP
Abbreviation for Apollo Lunar Science Experiment Package, experimental set-ups that were deployed on the Moon by astronauts during the manned Apollo programme (1969-72). One was left by every mission except the first. Each automated laboratory was powered by a small nuclear generator. The packages included seismometers to measure moonquakes and experiments to measure the solar wind, detect any trace atmosphere and measure the heat flow from the Moon's interior. All the experiments were turned off in 1978.