The habitable zone is

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The habitable zone is defined as the region around a star where a planet's temperature would permit the existence of liquid water, which is considered a necessary condition for life as we know it.  This means that not all planets within the habitable zone will necessarily have life, but it is a necessary condition for life to exist. The habitable zone is a region around a star where a planet's temperature would permit the existence of liquid water, which is considered a key ingredient for life as we know it. While other factors are also important for supporting life, the habitable zone is a starting point for the search for potentially habitable planets.

The Habitable Zone Is