which planet is the goldilocks zone
In astrobiology, the Goldilocks zone refers to the habitable zone around a star. A planet must neither be too far away from, nor too close to a star and galactic centre to support life. Either extreme would prevent a planet evolving life. Such a planet is colloquially called a Goldilocks planet.
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.