Two newly discovered forms of frozen salt water could help scientists resolve a mystery concerning the Solar System's ice-encrusted moons.
on Earth, the atoms in hydrated sodium chloride – more commonly known as salt water ice – arranged themselves in never-before-identified structures that have a much higher proportion of water molecules than salt.'s moon Europa, which seems more watery than scientists expect.says Earth and space scientist Baptiste Journaux"Salt and water are very well known at Earth conditions. But beyond that, we're totally in the dark.
Salt and water – also known as sodium chloride and dihydrogen oxide – are both abundant on our home world. When combined, molecules of salt dissolve throughout those of water to create a solution. The presence of the salt lowers the freezing point of the solution compared to unsalted water, but as the temperature continues to drop under typical Earth atmospheric conditions, it will eventually freeze.
On moons like Europa and Ganymede, which orbit Jupiter, and Saturn's moon Enceladus, scientists have also found evidence of salt and water, only the conditions both are found in happen to be rather different to those on Earth. Exposed to the near vacuum of space, far from the Sun, the surfaces of these distant worlds can get extremely cold.
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