circumstellar |
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| navigate by keyword : habitable planetary system circumstellar zone stellar evolution liquid water design vector study learning university astronomy astronomical cosmology education educational space planet earth biology biological solar sunlight science scientific universe star radiation ultraviolet ray orbiting sun milky galaxy temperature luminous exoplanet astrobiology element origin biogeochemical cycles natural habitability orbital period eccentricity astrophysical intelligent life radioactive decay atom |
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| illustration of astronomy and cosmology, habitable zone is the distance from a star at which liquid water could exist on orbiting planets' surfaces, Circumstellar habitable zone |
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