All these worlds are yours except Europa.

“Studies showed the moon could have enough oxygen to support the kind of life we are most familiar with on Earth…[T]he new study suggests this oxygen-rich layer could be far thicker than before thought, potentially encompassing the entire crust.” A examination of crust-stirring on Europa increases the potential for some kind of oceanic life on Jupiter’s moon. “‘I was surprised at how much oxygen could get down there,’ Greenberg said.”