Scientists say parts of the Moon will be set aside as crash zones for defunct lunar satellites.
Satellite numbers are expected to rise as space agencies plan bases and long-term missions.
Without an atmosphere, old spacecraft cannot burn up like those around Earth.
Most will need to be deliberately crashed into the lunar surface.
Uncontrolled impacts could damage scientific instruments and historic landing sites.
High-speed crashes also create dust clouds and strong vibrations.
Experts support designated impact zones to protect sensitive areas.
Some say controlled crashes could even help study the Moon’s internal structure.
