Difference between revisions 895497758 and 895498194 on enwiki

{{redirect|Goldilocks Zone|the more general principle|Goldilocks principle|the planet first called "Goldilocks"|70 Virginis b}}
{{redirect|Habitable zone|the galactic zone|Galactic habitable zone}}
{{redirect|Comfort zone (astronomy)|other uses|Comfort zone (disambiguation)}}
{{merge from|Habitable Exoplanet|date=November 2018}}
{{short description|Zone around a star with strong possibilities for stable liquid water on a suitable planet}}
(contracted; show full)le=A Volcanic Hydrogen Habitable Zone |last=Ramirez |first=Ramses |date=2017 |arxiv=1702.08618|last2=Kaltenegger |first2=Lisa |doi=10.3847/2041-8213/aa60c8 |volume=837 |issue=1 |pages=L4 |journal=The Astrophysical Journal Letters|bibcode=2017ApJ...837L...4R}}</ref> || An expansion of the classical carbon dioxide-water vapor habitable zone <ref name=kasting-1993 /> assuming a volcanic hydrogen atmospheric concentration of 50%.
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===Extrasolar extrapolation===
{{see also|Habitability of red dwa
rf systems|Habitability of orange dwarf systems}}
Astronomers use stellar flux and the [[inverse-square law]] to extrapolate circumstellar habitable zone models created for the Solar System to other stars. For example, although the Solar System has a circumstellar habitable zone centered at 1.34 AU from the Sun,<ref name="kopparapu-2013" /> a star with 0.25 times the luminosity of the Sun would have a habitable zone centered at <math>\sqrt{0.25}</math>, or 0.5, the distance from the star, corresponding to a distance of 0.67 AU. Various complicating factors, though, including the individual characteristics of stars themselves, mean that extrasolar extrapolation of the CHZ concept is more complex.

(contracted; show full){{authority control}}

[[Category:Search for extraterrestrial intelligence]]
[[Category:Planetary habitability]]
[[Category:Astronomical hypotheses]]
[[Category:Extraterrestrial life]]
[[Category:Articles containing video clips]]
[[Category:Extraterrestrial water]]