Technology term
Permanently Shadowed Region (PSR)
An area near a planetary body's pole where sunlight never reaches the surface because of local terrain and the low solar angle. On the Moon, these cold traps may preserve water ice and other volatile materials for very long periods.
English
Permanently Shadowed Region
Arabic
المنطقة دائمة الظل
First appeared in
China Delayed Its Moon-Ice Mission Just Before Launch
