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Habitability is the conformance of a residence or abode to the implied warranty of habitability. [circular definition] A residence that complies is said to be habitable.It is an implied warranty or contract, meaning it does not have to be an express contract, covenant, or provision of a contract.
Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial bodies. As exoplanets are too far away and can only be studied by indirect means, the celestial bodies in the Solar System allow for a much more detailed study: direct telescope observation, space probes, rovers and even human spaceflight.
The mass of a potentially habitable exoplanet is between 0.1 and 5.0 Earth masses. [18] However it is possible for a habitable world to have a mass as low as 0.0268 Earth Masses. [57] The radius of a potentially habitable exoplanet would range between 0.5 and 1.5 Earth radii. [18]
In ancient Greece, the term oecumene or ecumene (US; from Ancient Greek οἰκουμένη (oikouménē) 'the inhabited world') denoted the known, inhabited, or habitable world. In Greek antiquity , it referred to the portions of the world known to Hellenic geographers , subdivided into three continents: Africa , Europe , and Asia .
Habitability is conventionally defined by the equilibrium temperature of a planet, which is a function of the amount of incoming radiation; a planet is defined "habitable" if liquid water can exist on its surface although even planets with little external energy can harbour underground life.
In other words, a superhabitable world would likely be larger, warmer, and older than Earth, with an evenly-distributed ocean, and orbiting a K-type main-sequence star. [4] In 2020, astronomers, building on Heller and Armstrong's hypothesis, identified 24 potentially superhabitable exoplanets based on measured characteristics that fit these ...
KOI-1686.01 was also considered a potentially habitable exoplanet after its detection in 2011, until proven a false positive by NASA in 2015. [74] 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.
For example, according to Kopparapu's habitable zone estimate, although the Solar System has a circumstellar habitable zone centered at 1.34 AU from the Sun, [4] a star with 0.25 times the luminosity of the Sun would have a habitable zone centered at , or 0.5, the distance from the star, corresponding to a distance of 0.67 AU. Various ...