The Goldilocks Zone refers to the habitable zone around a sun where a planet could possibly sustain life. Not so close to the sun that it is too hot and not so far that it is too cold. Key to this habitability is water. In this narrow range of “just right” temperatures, water exists in three states; as a gas (water vapor), as a liquid (rain), and as a solid (snow and ice). Liquid water is necessary for all life, and the constant movement between the three states of water creates the microclimates in which we live. No life that we know of has ever evolved anywhere in the universe outside the narrow Goldilocks range of temperatures.
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