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The definition of “habitable zone” is the distance from a star at which liquid water could exist on orbiting planets’ surfaces. Habitable zones are also known as Goldilocks’ zones, where conditions might be just right – neither too hot nor too cold – for life.
In astronomy and astrobiology, the habitable zone (HZ), or more precisely the circumstellar habitable zone (CHZ), is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure.
25 de nov. de 2013 · These boundaries change for stars of different spectral types, because the calculated albedos of moist greenhouse and maximum greenhouse planets become lower (higher) as the star’s radiation is shifted toward the red (blue).
26 de feb. de 2013 · To assess the potential habitability of extrasolar terrestrial planets, we propose using stellar flux incident on a planet rather than equilibrium temperature. This removes the dependence on planetary (Bond) albedo, which varies depending on the host star's spectral type.
Model the habitable zone around stars and how an atmosphere influences the habitability of a planet. Topics Covered • How a planet's atmosphere and the distance from its sun affect conditions. • What kind of planet has liquid water? Participants Use this activity with families, the general public, and school or youth groups ages 8 and up.
The concepts of the HZ and CHZ help define an astronomical search zone for habitable planets with remotely detectable species in their atmosphere that indicate habitable conditions, such as surface liquid water.
The habitable zone concept was first applied to the space around a star, now called the Circumstellar Habitable Zone. Recently, other, vastly broader, habitable zones have been proposed. We review the historical development of the concept of habitable zones and the present state of the research.
