A reanalysis of abandoned data from NASA's Apollo missions has uncovered more than 22,000 previously unknown moonquakes. Moonquakes are the lunar equivalent of earthquakes , caused by movement in the moon's interior. Unlike earthquakes, these movements are caused by gradual temperature changes and meteorite impacts, rather than shifting tectonic plates (which the moon does not have, according to NASA. In 1969 and 1977, seismometers deployed by Apollo astronauts detected around 13,000