Assertion: moon's pole | /r/CreatedBy | the presence of water ice
Facets:
value: within permanently shadowed craters
type: LOCATION
Source sentences:
text: This was followed in 1998 by the Lunar Prospector mission, whose instruments indicated the presence of excess hydrogen at the lunar poles, which is likely to have been caused by the presence of water ice in the upper few meters of the regolith within permanently shadowed craters.