New research suggests the moon might retain enough water for a moonbase and rocket fuel.
Ancient volcanic eruptions may have buried hundreds of feet of ice on the moon's poles.
Two fifths of the water vapour emitted by volcanoes two to four billion years ago may have settled in dark craters.
Thousands of square miles of the moon's surface were covered with lava rivers and lakes, creating the black blotches, or maria, that make it so unique today.
The experts estimate these volcanoes may have left dozens or hundreds of feet of ice around the poles.