In July 2026, a spent Falcon 9 rocket stage from SpaceX crashed onto the Moon, unintentionally drawing attention to the growing issue of lunar pollution caused by human space activities. Although the crash was not planned, it provided scientists with a rare opportunity to study the Moon’s surface in detail. This incident is not the first of its kind, as similar events have occurred in the past, notably during the Apollo missions of the 1970s. The roots of such lunar impacts trace back to the Apollo 12 mission in 1969. During that mission, vibrations from the spacecraft’s landing were detected by a seismometer left on the Moon by the Apollo 11 astronauts, Neil Armstrong and Buzz Aldrin. The seismic waves behaved differently than expected, taking several minutes to reach their peak and then gradually fading over an hour. This unusual behavior intrigued NASA scientists, who realized the Moon’s unique composition—dry and solid—allowed seismic waves to travel and resonate in ways not seen on Earth. Inspired by this discovery, NASA decided to intentionally crash the third stage of the Saturn V rocket onto the Moon during the Apollo 13 mission in 1970. The first two stages returned to Earth as usual, but the third stage continued on its trajectory and struck the Moon at approximately 10,000 kilometers per hour, just 135 kilometers from the Apollo 12 seismometer. The impact created a massive explosion equivalent to 7.7 tons of TNT, and the seismic waves lasted for four hours—far longer than any similar event on Earth. This helped scientists better understand the Moon’s internal structure and the nature of seismic activity on its surface. Following this experiment, NASA continued to use lunar impacts as a tool for scientific research, placing new seismometers at each mission to build a more comprehensive sensor network. These instruments were eventually placed into hibernation in 1977, as manned lunar missions declined in frequency. Although they could not directly observe the 2026 SpaceX crash, the data they collected over the years significantly advanced our understanding of the Moon’s interior. The recent incident, while unintentional, once again highlights the Moon’s role as a natural laboratory for studying planetary science, even as it raises questions about the long-term impact of human activity in space.