habitable zone kya hai
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In astronomy and astrobiology, the circumstellar habitable zone, or simply the habitable zone, is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure.
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Currently only the Earth falls in the Solar System's habitable zone. It starts behind the orbit of Venus at 0.95 a.u. and ends before orbit of Mars at 1.37 a.u. The habitable zone will exist only around the star with the appropriate mass and chemical composition.
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