Maybe a few are, but we realize now that most have a rocky composition. The temperature is too hot for sulfur. |
There were only tantalizing hints of what might be there. Voyager raised many questions. It just didn't have the answers. |
We're certain there's water. We're not certain it's liquid. The evidence that there might be liquid water is compelling. I think that liquid water is just below the surface. But a different school of thought says the ice layer is much thicker. |