- Ammonia (NH4), is abundant in the universe, and a strong candidate as a hypothetical alternative solvent to water.
- At Earth-like pressures, ammonia is liquid only at extremely low temperatures, so hypothetical life using ammonia as a solvent might thrive in freezing (relative to water) temperatures.
- Ammonia/water mixtures also have liquid temperature ranges (at normal pressures) well below that of just water.
- Titan, moon of Saturn, is believed to have subsurface oceans of a liquid ammonia/water mixture.
- Resources include: http://en.wikipedia.org/wiki/Hypothetical_types_of_biochemisty
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