There is no single number for water in space, because it exists in the forms of ice, vapor, and liquid on countless planets.
Water is widely distributed throughout the universe; it is found in interstellar clouds, comets, satellites, planets, and even in the planet-forming rings surrounding young stars.
NASA has stated that vast amounts of water in gaseous form exist within 'stellar nurseries"—regions where new stars and planetary systems emerge.
Astronomers have discovered vast reservoirs near distant black holes, containing quantities of water equivalent to trillions of Earth's oceans.
Earth, the Moon, Mars, comets, and icy ocean worlds like Europa and Enceladus all contain water in our solar system.
Some moons may harbor global oceans beneath frozen outer layers, meaning that some planets could possess a greater total volume of water than Earth.
On Mars, scientists have discovered traces of ancient rivers, subsurface ice, and massive underground deposits resembling extinct oceans.
Webb and other telescopes have also detected water in the rings where planets are forming; this reveals that it is a key element essential for the emergence of life.
Water formed when hydrogen released during the Big Bang combined with oxygen created inside stars; this process directly links water to the history of the universe.
Therefore, space contains an astonishing amount of water; however, most of it is scattered, frozen, hidden, or still very far away.