In November 1969, Apollo 12 astronauts deliberately crashed the lunar module’s empty ascent stage into the Moon to create a controlled seismic signal. The impact was detected by the Passive Seismic Experiment left near the landing site, producing unusually long-lasting vibrations. Later research showed that the Moon’s fractured, dry near-surface layers scattered seismic energy, allowing the signals to persist far longer than similar impacts on Earth. The experiment became part of a series of deliberate lunar impacts that helped scientists study the Moon’s interior.
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