Orbital eccentricity is a measure of the deviation of an orbit from circularity, quantified by a number ranging from 0 to 1. A circular orbit has an eccentricity of 0, while a highly elongated, elliptical orbit has an eccentricity close to 1. This parameter plays a crucial role in determining the climate and temperature stability of celestial bodies, influencing whether they can maintain conditions conducive to life within their habitable zones.
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