[clarionbell]

Water, not carbon. Carbon itself isn't enough, in order for the fine machinery of life to work you need solvent. On Earth it's water. Limits of Earth bound life are determined in great part by properties of water, when it boils and when it freezes.

The Goldilocks zone itself is a bit of an outdated concept now. Largely because we now know that liquid water exists way beyond the orbit of Mars, in oceans of Europa and Enceladus at very least. Something similar is the case with Venus. Surface is too hot for liquid water, but high atmosphere is pretty much fine.