Based on the wildly diverse adaptations that life on earth has managed to accomplish, the current search for planets in the "Goldilocks" zone is to restrictive as to the type of circumstances that are required for a "Goldilocks" environment. Such zones may be found in any semi-stable environment where there is a transition from "to hot" to "to cold". Using this basis I believe that it will be discovered that our solar system has many "Goldilocks" zones. To begin with, why wouldn't Venus, Saturn, Jupiter, Uranus, & Neptune not have such zones? They all have "to hot" enteriors while thier outer atmospheres being "to cold". Yes, there is vigorous (if not violent) vertical mixing but I think we are under estimating life's adapability & ability to find niches. The same holds true for tidally locked planets and moons that are "to hot" on one side & "to cold" on the other. Should there not be a "Goldilocks zone" somewheres inbetween? One argument is that a lack of atmosphere or a violently interacting atmosphere would eliminate the possibility of life. But you don't need an atmosphere to sustain life (see Earth life). It is might even be possible that our moon has a "Goldilocks zone" at the poles where perpetual darkness transitions to sun warmed surfaces.