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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.
That's because scientists were looking only at sun-like stars, which are not the most common stars. An earlier study found that 15 percent of the more common red dwarf stars have Earth-size planets that are close-in enough to be in the not-too-hot, not-too-cold Goldilocks Zone.