Ice is water frozen into a solid state. Depending on the presence of impurities such as particles of soil or bubbles of air, it can appear transparent or a more or less opaque bluish-white color.

In the Solar System, ice is abundant and occurs naturally from as close to the Sun as Mercury to as far as the Oort cloud. Beyond the Solar System, it occurs as interstellar ice. It is abundant on Earth's surface  particularly in the polar regions and above the snow line  and, as a common form of precipitation and deposition, plays a key role in Earth's water cycle and climate. It falls as snowflakes and hail or occurs as frost, icicles or ice spikes.

Ice molecules can exhibit up to sixteen different phases (packing geometries) that depend on temperature and pressure. When water is cooled rapidly (quenching), up to three different types of amorphous ice can form depending on the history of its pressure and temperature. When cooled slowly correlated proton tunneling occurs below 20 K giving rise to macroscopic quantum phenomena. Virtually all the ice on Earth's surface and in its atmosphere is of a hexagonal crystalline structure denoted as ice Ih (spoken as "ice one h") with minute traces of cubic ice denoted as ice Ic. The most common phase transition to ice Ih occurs when liquid water is cooled below 0°C (273.15K, 32°F) at standard atmospheric pressure. It may also be deposited directly by water vapor, as happens in the formation of frost. The transition from ice to water is melting and from ice directly to water vapor is sublimation.

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Latest News for: Water discovery


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The Los Angeles Times 13 Aug 2020
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The Los Angeles Times 12 Aug 2020
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Cinema Blend 12 Aug 2020
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The Oregonian 11 Aug 2020
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Slashdot 11 Aug 2020
... hydrohalite was a clear sign Ceres used to have sea water ... Writing in an accompanying comment article, Julie Castillo-Rogez, from the California Institute of Technology's Jet Propulsion Laboratory, said the discovery of hydrohalite was a "smoking gun" for ongoing water activity....

Dwarf planet Ceres is an ocean world: study

Dawn 11 Aug 2020
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Yahoo Daily News 11 Aug 2020
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'Shark Week' kicks off with Mike Tyson and a major shark breach

CNN 10 Aug 2020
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The Oregonian 10 Aug 2020
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5 things to watch this week: New projects from Jamie Foxx, Seth Rogen and ‘Scrubs’ creator

Cleveland 10 Aug 2020
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Dwarf planet Ceres is a water world

The National 10 Aug 2020
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Popular Science 10 Aug 2020
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