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A habitable zone (HZ) in astronomy is a region of space where conditions are best for life to form as on Earth. Planets in these areas are the most likely to have extraterrestrial life. The habitable zone may also be called the life zone, comfort zone, green belt or Goldilocks zone. One in five stars have an Earth-sized planet in the habitable zone. However, it is not known what proportion would have conditions suitable for life.
A new definition of the habitable zone around planets, denoting where liquid water could exist, shifts Earth toward the very edge of the solar system's own habitable zone. Credit: PHL @ UPR Arecibo, Rogelio Bernal Andreo View full size image. One of the most important characteristics of an alien planet is whether or not it falls into what's called the habitable zone Â­â a Goldilocks-like range of not-too-close, not-too-far distances from the parent star that might allow the planet to host life.