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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.
This is an historic discovery of the first truly Earth-size planet found in the habitable zone around its star, Geoff Marcy, an astronomer at the University of California, Berkeley, who is unaffiliated with the research, told Space.com via email.o, while it's not an Earth twin, it is perhaps an Earth cousin. It has similar characteristics, but a different parent. [ 10 Exoplanets That Could Host Alien Life ]. This artist illustration shows the planet Kepler-186f, the first Earth-size alien planet discovered in the habitable zone of its star.