Lunar Seismic Profiling Experiment
The Lunar Seismic Profiling Experiment (LSPE) was a Moon, lunar science experiment, deployed by astronauts on the lunar surface in 1972 as part of Apollo 17. The goal of the LSPE was to record the seismic response generated by a variety of sources including the detonation of eight explosive charges, the ascent propulsion system on the lunar module and any natural sources. Background The Active Seismic Experiment (ASE) had flown on both Apollo 14 and Apollo 16, 16 providing information both about near-surface structures through the use of Mortar (weapon), mortars, and information about deep lunar structures by measuring the impacts of previous lunar modules and Saturn V S-IVB, third stages. However, between these two sub-surface levels, little was known about the upper 10 km of the Moon's surface. The LSPE was specifically designed to reduce this knowledge gap. It would record the seismic response generated by a variety of sources including the detonation of eight explosive ...
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Moon
The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of Australia). The Moon is a planetary-mass object with a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term and larger than all known dwarf planets of the Solar System. It lacks any significant atmosphere, hydrosphere, or magnetic field. Its surface gravity is about one-sixth of Earth's at , with Jupiter's moon Io being the only satellite in the Solar System known to have a higher surface gravity and density. The Moon orbits Earth at an average distance of , or about 30 times Earth's diameter. Its gravitational influence is the main driver of Earth's tides and very slowly lengthens Earth's day. The Moon's orbit around Earth has a sidereal period of 27.3 days. During each synodic period ...
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