The rise of hydrological science off Earth

It has been a long lasting interest to understand the laws that underlie water movement on Earth with the purpose to control it and make use of it. It is now recognized that water is not exclusive to the Earth but, rather, is a major constituent of the matter in the universe and may be a proxy for life in other planets as well. In this paper, we reflect on the need to expand the boundaries of the current water sciences from the description of mere terrestrial hydrological processes to a comprehensive inclusion of the physical laws and processes pertaining to water dynamics off Earth. Are we at the edge of a new scope of hydrology?