Marcus Knudson
Marcus Knudson

A proposed form of ice acts like a cross between a solid and a liquid. Now, a new study strengthens the case that the weird state of matter really exists.

Hints of the special phase, called superionic ice, appeared in water ice exposed to high pressures and temperatures, researchers report February 5 in Nature Physics. Although such unusual ice isn’t found naturally on Earth, it might lurk deep inside frozen worlds like Uranus and Neptune.

“It’s definitely providing more insight into water at these conditions,” says physicist Marcus Knudson of Washington State University in Pullman.

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