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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.
New discovery is likely to be a rocky world in the âGoldilocksâ zone of its parent star where the temperature is just right for liquid water to flow. An Earth-like planet orbiting a star that has formed a planetary nebula. Earlier in its life, this planet may have resembled the newly discovered Kepler 438b. Illustration: David A Aguilar/CfA.