NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft has spotted surface water molecules moving around dayside of Moon. Earlier it was believed that Moon was arid and water existed on it mainly as pockets in permanently shaded areas near poles. This finding will help scientists learn about accessibility of water that can be used by humans in future lunar missions.
Lunar hydration is tricky to measure from orbit due to complex way light reflects off the surface of the Moon. However, this discovery help scientists understand how water is bound to surface materials. It also revealed the amount of energy needed to remove water molecules from lunar materials. This water can potentially be used by astronauts in future to make fuel or for radiation shielding or thermal management.