Researchers say parts of the Moon will be set aside as graveyards for defunct satellites.
Lunar orbits are expected to fill rapidly as space agencies plan hundreds of missions.
Unlike Earth, the Moon has no atmosphere to destroy old spacecraft safely.
Most dead satellites will need controlled crash-landings on the surface.
Scientists warn uncontrolled impacts could damage instruments and historic sites.
High-speed collisions would also create dust clouds and surface vibrations.
Experts support designated impact zones far from sensitive locations.
Agencies including NASA and the European Space Agency are developing disposal plans.
Researchers say planned impacts could also help study the Moon’s internal structure.
