Researchers say parts of the Moon may be set aside as graveyards for defunct satellites.
Lunar orbits are expected to fill rapidly as space agencies plan bases, mining, and science missions.
Unlike Earth, the Moon lacks an atmosphere to burn up old spacecraft.
As a result, satellites often must be deliberately crashed into the surface.
Experts warn uncontrolled impacts could damage scientific instruments and historic sites.
High-speed collisions also create dust clouds and strong vibrations.
Dr Fionagh Thomson of University of Durham said careful planning is essential as activity increases.
More than 400 lunar missions are expected, including projects led by NASA and the European Space Agency.
Designated impact zones or deep craters are seen as the safest solution.
Agencies including the UK Space Agency are working on international guidelines.
