In planetary science, what does the Goldilocks Zone primarily define?

Answer

The orbital distance where temperatures are moderate enough for liquid water to exist on the surface.

The Goldilocks Zone in astrobiology refers to the orbital distance from a star where a planet's temperature allows for liquid water—not too hot to boil away, and not too cold to freeze solid.

In planetary science, what does the Goldilocks Zone primarily define?
Balanceprincipleeffectcondition