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And so … do we really know what we're looking for .. and where ?
What is a habitable zone ?
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Craig, this is an excellent question. It has been suggested that we are living in a narrow zone called the habitable zone. And yet it has also been suggested that some of the moons of Jupiter and Saturn may be candidates to harbour life. We may live in a narrow habitable zone for the life forms we see on Earth, but microscopic life may (or may not) exist far out in the solar system where we could clearly not survive.
So it may be that in our own solar system or in another star's system that there are more than one habitable zones, one for us, and one or more closer in to the star, or further out than we (or similar life forms?) are.
Stuart