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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.
Earth is in the Goldilocks zone witch is where it is not too hot and not too cold but the right temperature for life. Anything further away from the sun than the Earth is, is way below 0 degrees Celsius as mars is -250 degrees Celsius. 7 people found this useful.