<P> Gordon develops an apparatus which can permanently destroy a replica but Kelvin objects to using it on Rheya . Driven by his own grief and guilt over the "real" Rheya's death on Earth, he begins ingesting a chemical stimulant to stay awake in order to monitor Rheya, trying to avoid repeating the past and essentially abandoning her to suicide . Kelvin eventually falls asleep and Rheya successfully petitions Gordon to destroy her with the apparatus as she has done for her own replica (s). Traumatized, Kelvin confronts Dr. Gordon who maintains she merely facilitated in assisted suicide and only strives for the preservation of the humans on the station . </P> <P> Kelvin and Gordon then discover a dead body stashed away in a ceiling vent in the station's cold room--Snow . The Snow they have been interacting with is a replica . Confronted by Gordon and Kelvin, the Snow replica explains that upon being dreamed into existence, he was attacked by the real Snow and thus killed him in self - defense . He goes on to tell them that repeat usage of the apparatus has drained the ship's fuel cell reactor, making a return trip to Earth impossible . Furthermore, Solaris has begun to exponentially increase its mass, thereby gravitationally pulling the space station inexorably toward the planet . Gordon and Kelvin begin prepping a smaller space vehicle called Athena to escape . </P> <P> Back on Earth, Kelvin struggles to return to normal life, haunted by the idea that he "remembered her wrong"--that is, Rheya as being invariably suicidal . When he accidentally cuts his finger in his kitchen, the wound immediately heals, and it is then that Kelvin realizes that he never returned to Earth . In a flashback, Kelvin gives up the idea of boarding the lifeboat, and Doctor Gordon leaves him behind . As the plummeting space station rattles itself to pieces around him, the replica of Gibarian's young son appears and offers his hand in assistance . In the kitchen, Rheya appears to Kelvin yet again . This time, however, she is tranquil, and assures Kelvin that they no longer have to think in terms like "life" and "death," and that all they have ever done is forgiven . </P> <Ul> <Li> George Clooney as Dr. Chris Kelvin </Li> <Li> Natascha McElhone as Rheya </Li> <Li> Viola Davis as Dr. Gordon </Li> <Li> Jeremy Davies as Snow </Li> <Li> Ulrich Tukur as Gibarian </Li> <Li> John Cho as DBA Emissary #1 </Li> </Ul>

I don't understand the ending of solaris
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