SOON LUNAR ICE MINING WILL BE A THING, AS GOD AND ROBERT HEINLEIN INTENDED: The Source of Water Ice on The Moon Could Be Traced to a Seemingly Unlikely Source. “There’s water. Lots of water. Bound up in the lunar regolith. Trapped in volcanic glass. Possibly even in sheets of ice on or just below the surface, hiding in craters at the poles that lurk in permanent shadow, where it can’t be sublimated by the heat of the Sun.”