Scientists say parts of the Moon may become designated graveyards for defunct spacecraft.
The number of lunar satellites is expected to increase sharply in the coming decades.
Unlike Earth, the Moon has no atmosphere to burn up old satellites.
Most will eventually need to be crash-landed on the surface.
Uncontrolled impacts could damage scientific instruments and historic landing sites.
High-speed collisions also create dust clouds and surface vibrations.
Experts support using designated impact zones or deep craters.
The aim is to protect culturally and scientifically important areas.
