Specifically, Clementine's radar instrument detected highly reflective regions at the lunar poles, consistent with the presence of water ice. These findings were groundbreaking, as they were the first strong evidence suggesting the existence of water ice on the Moon.
It's important to note that Clementine's data didn't definitively prove the presence of water ice. Later missions, like the Lunar Crater Observation and Sensing Satellite (LCROSS) and the Lunar Reconnaissance Orbiter (LRO), provided further confirmation and characterized the nature and distribution of water ice at the lunar poles.
