Solaris, written by Stanislaw Lem, is a philosophical science fiction novel that takes place on a distant planet covered by a mysterious ocean. The story follows psychologist Kris Kelvin as he arrives on the space station orbiting Solaris to study the planet's strange phenomena. As Kelvin delves into the enigma of Solaris, he confronts his own past and grapples with the nature of reality, consciousness, and the limitations of human understanding. Solaris is a thought-provoking exploration of alien mysteries and the complexities of human perception.