NASA launched a lunar orbiter Wednesday night that will trace the Moon's elusive water cycle. Lunar Trailblazer, a collaboration between NASA, Northern Arizona University, and Lockheed Martin Space, ...

This is important for growing settlements. The water cycle works by using the energy of the Sun to move water from oceans and lakes to the atmosphere, and then back into the oceans again.

Water moves around the world in "atmospheric rivers" as part of the global water cycle, explained the report from the Global Commission on the Economics of Water. Water evaporates from ground ...