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A diagram depicting habitable zone boundaries across star type with September 2024 data, based on previous habitable zone diagrams. [1] Earth is plotted alongside 42 exoplanets with radii less than 2 times that of Earth or masses less than 5 times that of Earth, making them potentially rocky worlds in the habitable zone.
The planet's habitable zone, ranging from 0.1–0.4 to 0.3–1.3 astronomical units (AU), [4] [better source needed] depending on the size of the star, is often far enough from the star so as not to be tidally locked to the star, and to have a sufficiently low solar flare activity not to be lethal to life. In comparison, red dwarf stars have ...
For example, Kepler-47c is a gas giant in the circumbinary habitable zone of the Kepler-47 system. [citation needed] If Earth-like planets form in or migrate into the circumbinary habitable zone, they would be capable of sustaining liquid water on their surface in spite of the dynamical and radiative interaction with the binary stars. [10]
A habitable planet orbiting a neutron star must be between one and 10 times the mass of the Earth. If the planet were lighter, its atmosphere would be lost. Its atmosphere must also be thick enough to convert the intense X-ray radiation from the neutron star into heat on its surface allowing it to have a temperature suitable for life. [1]
A conventional habitable zone is defined by liquid water. Habitable zone (HZ) (also called the circumstellar habitable zone), the orbit around a star that would allow liquid water to remain for a short period of time (a given period of time) on at least a small part of the planet's surface.
Similarly, Tau Ceti e was thought to be likely habitable, [82] but with improved models of the circumstellar habitable zone, as of 2022 PHL does not consider it potentially habitable. [ 1 ] [ failed verification ] Kepler-438b was also initially considered potentially habitable; however, it was later found to be a subject of powerful flares that ...
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 habitable zone around yellow dwarfs varies according to their size and luminosity, although the inner boundary is usually at 0.84 AU and the outer one at 1.67 in a G2V class dwarf like the Sun. [19] For a G5V class star with a radius of 0.95 R☉—smaller than the Sun—the habitable zone would correspond to the region located between 0.8 ...