Planet Earth is in the Goldlocks zone, why and how?

In cognitive science and developmental psychology, the Goldilocks effect or principle refers to an infant's preference to attend to events which are neither too simple nor too complex according to their current representation of the world.^[3]This effect was observed in infants, who are less likely to look away from a visual sequence when the current event is moderately probable, as measured by an idealized learning model.

In astrobiology, the Goldilocks zone refers to the habitable zone around a star. The Rare Earth Hypothesis uses the Goldilocks principle in the argument that a planet must neither be too far away from, nor too close to a star and galactic center to support life, while either extreme would result in a planet incapable of supporting life.^[4] Such a planet is colloquially called a "Goldilocks Planet".