Apollo 11 passive seismic experiment package full size model.

This is a full-size model of thePpassive Seismic Experiment Package (PSEP) left on the lunar surface by the crew on Apollo 11. It was the first ever seismometer to land on a different celestial body. This experiment was sent to the moon to measure its seismic activity. The PSEP experiment ended just over a month after its deployment when the instrument failed, probably due to overheating during the lunar daytime. However other seismometers used at landing sites for Apollo 12, 14, 15 and 16 transmitted data until September 1977. These seismometers provided valuable data on ‘Moonquakes’ and other seismic occurrences on the moon like meteorite impacts. So far, seismometers have only been sent to the Moon and Mars.