Why Waste on the Moon Could Be a Problem

The European Space Agency (ESA) has raised concerns over the growing amount of human-made debris on and around the Moon, warning that it could pose risks to future lunar missions. The issue comes amid increasing interest in returning to the Moon, with nations planning infrastructure such as bases and orbital platforms. According to ESA officials, nearly 200 tons of waste have been left behind since the first moon landings, much of which is now useless. Additionally, unknown quantities of space junk orbiting the Moon remain untracked due to observational challenges. The accumulation of debris began long before humans set foot on the Moon's surface. As early as the 1960s, during the Apollo missions, astronauts left behind items ranging from personal effects to scientific equipment. These include approximately 100 bags containing human waste, which were discarded to save weight and fuel for return trips. Other notable remnants include two golf balls taken by astronaut Alan Shepard during the Apollo 14 mission, a family photo left by Charlie Duke during Apollo 16, and a sculpture brought by David Scott during Apollo 15. This sculpture was placed alongside a plaque listing the names of astronauts who had died in service to space exploration. Beyond these visible artifacts, the Moon’s surface is littered with spent landers, crashed satellites, and rocket stages from both manned and unmanned missions. Since 1959, there have been nearly 150 lunar missions, many of which involved spacecraft designed to enter lunar orbit. However, not all of them successfully did so, leaving some objects stranded in unstable orbits. Due to the Moon’s weaker gravitational pull compared to Earth’s, few of these orbits are stable over time. Objects in unstable orbits can eventually crash onto the Moon’s surface, fall back toward Earth, or drift into deep space. Tracking this debris presents unique difficulties. According to Jan Siminski, a researcher at ESA’s Space Debris Office, the exact number of objects currently orbiting the Moon is unknown because they are difficult to observe. Low lunar orbits cannot be monitored effectively using current telescopes or radar systems due to interference caused by the Moon’s surface. This makes it challenging to determine how many pieces of debris are present and their potential trajectories. The risk posed by this debris becomes more pronounced as plans for sustained lunar presence gain momentum. With more spacecraft and robotic landers heading to the Moon, the likelihood of collisions increases. Such impacts could create thousands of smaller fragments, posing hazards to future missions. Similar issues have already been observed in Earth’s orbit, where space debris has led to the destruction of satellites and forced adjustments in orbital paths to avoid collisions. The ESA is working to address this problem through improved tracking technologies and international cooperation. Efforts are underway to develop better methods for monitoring lunar debris, including enhanced radar systems and optical telescopes capable of detecting small objects in low lunar orbits. These initiatives aim to provide accurate data on the location and movement of debris, enabling safer navigation for future lunar missions. In addition to tracking existing debris, the ESA is advocating for stricter guidelines on what should be left behind on the Moon. Current practices vary widely among different space agencies and private companies, leading to inconsistent approaches to managing lunar waste. Some organizations have begun implementing policies aimed at minimizing the environmental impact of their operations, while others continue to prioritize mission objectives over long-term sustainability. As the global focus shifts toward establishing a permanent human presence on the Moon, the need for coordinated efforts to manage space debris becomes increasingly urgent. Without effective measures, the Moon could become another example of a celestial body burdened by human activity, similar to Earth’s crowded orbital environment. The challenge lies not only in identifying and tracking the debris but also in developing strategies to mitigate its impact on future exploration and research.