Lunar samples show evidence that solar wind could be behind the water molecules on the moon's surface, according to NASA. The ...

This vapor formed a disc around the Earth that eventually cooled and clumped together to become the moon. We know this thanks to rigorous studies of meteorites and rock samples, including at the ...

Cassini first discovered evidence of a vast ocean on Enceladus by spotting plumes of water vapor jutting out of Enceladus ... a distant world like Jupiter's moon Europa or Saturn's moon Enceladus.