New Scientist magazine, 4th September 2010
Water is now thought to exist in a really exotic form in the centre of Uranus and Neptune.
Image reproduced according to the licence at: http://en.wikipedia.org/wiki/File:Neptune.jpg
Extremely high temperatures and high pressures mean that the water may behave like a solid and a liquid at the same time. The extreme conditions would mean that the water becomes ionised – oxygen ions would form a crystal like lattice that would allow hydrogen ions to flow through it.
And the wierdest thing of all …. the water should glow yellow!