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The Habitable Zone
A star's habitable zone is the region around it in which planets could have liquid water on its surface.
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The diagram shows the habitable zones GREEN
The BLUE areas are too cold; any liquid surface water would be completely frozen.
The RED areas are too hot; the liquid surface water would be lost as a result of a runaway greenhouse effect.
The Habitable Zone in the Solar System
Only the Earth and Mars are in the habitable zone because we could find liquid water in them.
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