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... is there any way to prevent water from freezing in sub-freezing temperatures, i.e. putting it under so much pressure it cannot expand and as a result not freeze?
put it in a vacuum.
The solid, core structure of a comet is known as the nucleus. Cometary nuclei are composed of an amalgamation of rock, dust, water ice, and frozen gases such as carbon dioxide, carbon monoxide, methane, and ammonia