Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The Caspian Sea is also classed as the world's largest lake.
52
Water is actually naturally blue.
48
There was once an undersea post office in the Bahamas.
241
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
707