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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.
The discovery of Kepler-186f confirms that planets the size of Earth exist in the habitable zone of stars other than our sun. The habitable zone is defined as the range of distances from a star where liquid water might pool on the surface of an orbiting planet. While planets have previously been found in the habitable zone, the previous finds are all at least 40 percent larger in size than Earth and understanding their makeup is challenging.