> The planet; as-in this rocky, water-world orbiting Sol, will exist for BILLIONS of years
Well, to nitpick a bit, not billions, for the "water-world" part. A few hundred million. It'll likely be quite parched by the 1 billion mark. Large, complex life forms are expected to have a Really Bad Time starting in the 500-600 million year range and shortly (geologically speaking) be gone entirely, assuming no acute planet-scale disasters before then.
Well, to nitpick a bit, not billions, for the "water-world" part. A few hundred million. It'll likely be quite parched by the 1 billion mark. Large, complex life forms are expected to have a Really Bad Time starting in the 500-600 million year range and shortly (geologically speaking) be gone entirely, assuming no acute planet-scale disasters before then.
https://en.wikipedia.org/wiki/Timeline_of_the_far_future