The mass of water vapour is at least 140 trillion times more than all of the water in the world's oceans combined. Because the quasar is so far away, its light has taken 12 billion years to reach ...

Floating is when something stays on top of the surface of the water, like a boat. Sinking is when something drops beneath the surface of the water and falls to the bottom, like a stone.

They found that 4.47 million cubic meters (m3) of water evaporated from the reservoir in the space of a year, equivalent to 10.4% of the water volume consumed annually by the local population.