Researchers say parts of the Moon will be set aside as spacecraft graveyards for defunct satellites.
Lunar orbits are expected to fill rapidly as space agencies plan bases, mining, and scientific missions.
Without an atmosphere, old satellites cannot burn up and must be deliberately crashed.
Uncontrolled impacts could damage scientific instruments and historic landing sites.
Experts warn collisions create craters, vibrations, and dust that threaten sensitive equipment.
More than 400 Moon missions are planned, including projects led by NASA and international partners.
The European Space Agency is already planning safe disposal for future lunar satellites.
Designated impact zones are seen as the most practical solution.
