Habital zone chart

A picture of the solar system with the Habitable zone outlined in yellow.

The habitable zone, officially circumstellar habitable zone (CHZ), is the range of an orbit around the Sun within which a planetary surface can support liquid water, given sufficient atmospheric pressure.[1][2][3][4][5]


The bounds of the CHZ are based on Earth's position in the Solar System and the amount of radiant energy it receives from the Sun. The perfect conditions for complex life, are called Goldilocks conditions. Due to the importance of liquid water to Earth's biosphere, the nature of the CHZ and the objects within it may be instrumental in determining the scope and distribution of Earth-like extraterrestrial life and intelligence in theoretical habitable zones of other star systems.

Planets within a CHZ Edit

See alsoEdit


  1. Su-Shu Huang, American Scientist 47, 3, pp. 397- 402 (1959)
  2. Dole, Stephen H (1964). Habitable Planets for Man. Blaisdell Publishing Company. p. 103. 
  3. J. F. Kasting, D. P. Whitmire, R. T. Reynolds, Icarus 101, 108 (1993).
  4. Kopparapu, Ravi Kumar (2013). "A revised estimate of the occurrence rate of terrestrial planets in the habitable zones around kepler m-dwarfs". The Astrophysical Journal Letters 767 (1): L8. doi:10.1088/2041-8205/767/1/L8. Bibcode2013ApJ...767L...8K. 
  5. Cruz, Maria; Coontz, Robert (2013). "Exoplanets - Introduction to Special Issue". Science 340 (6132): 565. doi:10.1126/science.340.6132.565. Retrieved 18 May 2013. 


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