Solaris asks way more questions than it answers. How does a planet evolve a sentient ocean? Did the ocean arrive from elsewhere to a dry planet? On what substrate would sentient oceand form and how would they reproduce?
(aside of a a joke that the universe (with us as a part of it) is not evolving but computing a number (42 exactly) - which eventually may become real thanks LLM) [Lem:Dick .. (Adams)]