Solaris is a 1972 Russian science-fiction film based on the novel Solaris by Polish author Stanislaw Lem. It is directed by acclaimed Soviet director Andrei Tarkovsky.

From wikipedia:

"The film ends with Kelvin in a sense returning back to Earth, although viewers are divided on whether he goes to a simulation of one part of Earth on the planet Solaris (as the zooming-out at the very end, showing a small piece of land floating in a large ocean, seems to suggest), whether he actually goes back to Earth, or whether he somehow stays on the space station. Another possible reading of the ending is that the return scene which the viewer sees takes place first in Kelvin's mind, then in the mind of the Ocean which has picked up his thoughts and replays them. This would imply that the Ocean has come to comprehend his emotions and a form of inter-species communication has taken place (which would contradict Lem's message that such comprehension is impossible). In a sense, it does not matter - one of the many themes explored in the film is the subjective nature of reality. Wherever Kelvin is "really" located at the end of the film, it does not make a difference for him."