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Planetary habitability is the measure of a planet''s or a natural satellite''s potential to sustain life. Life may develop directly on a planet or satellite or be transferred to it from another body. As the existence of life beyond Earth is currently uncertain, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and solar system which appear favorable to life''s flourishing. Research and theory in this regard is a component of planetary science and the emerging discipline of astrobiology. The book visits the components needed to produce life on planets in and outside our solar system.