We all have always wondered if there is life far away from earth how it looks like. Do aliens really exist? If they really do then how their planets are? What makes the earth habitable? Is it water, air or the atmosphere? Various factors are involved in the answer of this question and one of them is Goldilocks zone.
We know goldilocks zone by different names – habitable zone, circumstellar zone. Most of the star system in universe support habitable zone.
What is Goldilocks Zone?
Orbit range around the star favorable for life. It includes liquid water and sufficient atmospheric pressure. When a planet share the favorable position for life in the star system then we can say that their is possibility of life in that planet. An area around the star where surface of rocky planet can sustain liquid water is one of the basic definition of habitable zone.

Concept of goldilocks zone

Calculation of habitable zone of a star includes absolute magnitude of star, apparent magnitude of star, distance from earth to star and various other factors are involved in this calculation. The distance of planet from star is not the only factor for stellar habitable zone. Su-Shu Huang, an American astrophysicist coined the term “habitable zone” in 1959. The concept was first presented in 1953. According to an estimation there are 8 to 20 billion potentially habitable, Earth-like worlds in our galaxy alone. But it is not necessary that they are habitable.The distance Earth orbits the Sun is just right not to hot and not too cold. But in following decades the idea of primary creation of life is evolving and hence the concept of Circumstellar habitable zone is evolving too.