Steamy World Could Be a Sample of Water-Rich Planets Throughout Our Galaxy The search for life in space goes hand-in-hand with the search for water on planets around other stars. Water is one of the most common molecules in the universe, and all life on Earth requires it. Water functions as a solvent by dissolving substances and enabling key chemical reactions in animal, plant, and microbial cells. It is much better at this than other liquids.
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