Als habitable Zone (auch Lebenszone oder veraltet Ökosphäre, missverständlich auch bewohnbare Zone; englisch u. a. Goldilocks Zone) bezeichnet man im Allgemeinen den Abstandsbereich, in dem sich ein Planet von seinem Zentralgestirn befinden muss, damit Wasser dauerhaft in flüssiger Form als Voraussetzung für erdähnliches Leben auf der Oberfläche vorliegen kann. ...http://en.wikipedia.org/wiki/Habitable_zone
Goldilocks Zone", "Comfort zone (astronomy)", and "Goldilocks planet" redirect here. For the planet initially nicknamed "Goldilocks", see 70 Virginis b. For other uses, see Comfort zone (disambiguation), Goldilocks (disambiguation), and the Goldilocks Principle.
In astronomy and astrobiology, habitable zone (more accurately, circumstellar habitable zone or CHZ) is the scientific term for the region around a star within which it is theoretically possible for a planet with sufficient atmospheric pressure to maintain liquid water on its surface.1
The significance of the concept is in its inference of conditions favorable for life on Earth – since liquid water is essential for all known forms of life, planets in this zone are considered the most promising sites to host extraterrestrial life. The terms "ecosphere" and "Liquid Water Belt" were introduced by Hubertus Strughold and Harlow Shapley respectively in 1953. Contemporary alternatives include "HZ", "life zone", and "Goldilocks Zone".
"Habitable zone" is sometimes used more generally to denote various regions that are considered favorable to life in some way. One prominent example is the Galactic Habitable Zone, coined by Guillermo Gonzalez in 1995 (representing the distance of a planet from the galactic centre), based on the position of the Earth in the Milky Way. If different kinds of habitable zones are considered, their intersection is the region considered most likely to contain life.