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Su-Shu Huang, an American astrophysicist, first introduced the term "habitable zone" in 1959 to refer to the area around a star where liquid water could exist on a sufficiently large body, and was the first to introduce it in the context of planetary habitability and extraterrestrial life.
KOI-1686.01 was also considered a potentially habitable exoplanet after its detection in 2011, until proven a false positive by NASA in 2015. [ 72] Several other KOIs, like Kepler-577b and Kepler-1649b, were considered potentially habitable prior to confirmation, but with new data are no longer considered habitable.
A K-type star's habitable zone approximately ranges between 0.1–0.4 to 0.3–1.3 AU from the star. Here, exoplanets will receive only a relatively small amount of ultraviolet radiation, especially so towards the outer edge. This is favorable to support life, as it means that there is enough radiated energy to allow liquid water to exist on ...
Since its star is so much smaller than the sun, Gliese 12b still falls within the habitable zone — the ideal distance away from a star where liquid water can exist — even though it completes ...
The habitable zone (HZ) is a shell-shaped region of space surrounding a star in which a planet could maintain liquid water on its surface. [19] The concept was first proposed by astrophysicist Su-Shu Huang in 1959, based on climatic constraints imposed by the host star. [ 19 ]
The violent flaring period of a red dwarf's life cycle is estimated to last for only about the first 1.2 billion years of its existence. If a planet forms far away from a red dwarf so as to avoid tidal locking, and then migrates into the star's habitable zone after this turbulent initial period, it is possible for life to have a chance to develop.
For a dim star like TRAPPIST-1, the habitable zone [ah] is located closer to the star than for the Sun. [157] Three or four [57] planets might be located in the habitable zone; these include e, f, and g; [157] or d, e, and f. [75] As of 2017, this is the largest-known number of planets within the habitable zone of any known star or star system ...
The Alpha Centauri AB binary system can be seen in the background, to the upper right of Proxima. Proxima Centauri b is located within the classical habitable zone of its star [53] and receives about 65% of Earth's irradiation. Its equilibrium temperature is estimated to be about 234 K (−39 °C; −38 °F). [4]