A telescope flying in a converted 747 detected molecular water in Clavius crater, on ground that gets full daylight and reaches 100°C.

Ice in permanently shadowed polar craters had been expected. Water surviving in the open had not. The amounts are tiny — a few hundred parts per million, a hundredth of what is in the Sahara — and it is probably locked inside glass beads made by micrometeorite impacts, which is the only way it could still be there.