Answer:

rille

AnswerCrossword Clue
RILLELunar feature
RILLEMoon valley
RILLELunar trench
RILLELunar valley
RILLEMoon groove
RILLESelenologist's sighting
RILLEValley on the moon.
RILLEValley on the surface of the moon.
RILLEMoon valley.
RILLETrench on the moon's surface.
RILLEValley on moon.
RILLELunar cleft.
RILLELunar valley.
RILLECleft on the moon's surface.
RILLELunar feature.
RILLESight from Apollo craft
RILLEMoon feature
RILLEValley on the moon
RILLELunar depression
RILLELunar vale
RILLELunar surface feature
RILLEOne of Luna's depressions
RILLEValley for Selene
RILLEValley for an astronaut to explore
RILLEValley on the moon (Var.)
RILLEApollo 11 sighting
RILLEMoon valley (Var.)
RILLEValley of the moon