@gavvet, Absolutely better scientific topic discussion. That goes evolution of the humans. The Goldilocks Zone refers to the habitable zone around a star where the temperature is just right not too hot and not too cold - for liquid water to exist on an planet. There are at least a dozen or so potentially habitable exoplanets, planets which are in varying degrees similar to Earth.Looking for planets in the Goldilocks Zone is a way that allows scientists to hone in their search for Earth-like planets that could contain life. Basically, the assumption is that if it's possible there may be liquid water on the planet, then it's also possible that the planet may be habitable.
Our solar system has 3 planets which could qualify as being in the habitable of Goldilocks zone. Its named Earth; Mars; Venus.
"The only life we know about is our carbon-based life, and water plays a crucial part in our own existence, and so it's only natural that we direct our attention to planets in locations capable of having liquid water," - Professor John Webb of the University of New South Wales
Liquid water is essential for life as we know it. Where we find liquid water on Earth we also find life.
Would that be the same on exoplanets, or could it be some kind of life, different from "as we know it" and that requires something different to exist?