The little I know from this movie is that the earth had an impact with and asteroid or comet at the beginning of the film but I don't know nothing more of the plot , I am sorry for the bad description

Melancholia (2011)
Wikipedia synopsis:
Plot
The film begins with an introductory sequence involving the main characters and images from space and introducing many of the film's visual leitmotifs. The film continues in two parts.

Part One: "Justine"
Newlyweds Justine and Michael arrive two hours late to their own reception at the family estate where Justine's sister, Claire, and her husband, John, reside. Justine happens to notice a particularly bright red star in the twilight sky which John identifies as Antares.
... At dawn the next day, Justine reluctantly goes horseback riding with her sister when she notices that the bright red star has disappeared.

Part Two: "Claire"
Justine has become severely depressed and stays with Claire and John. John explains that the reason for Antares' disappearance was the rogue planet Melancholia blocking the star from view. Melancholia, a large blue planet that had formerly been hidden behind the sun, becomes visible in the sky as it approaches ever closer to Earth. John is excited about the planet and looks forward to the "fly-by" predicted by scientists.
Claire becomes fearful that the end of the world is imminent in spite of her husband's reassurances that everyone will be safe. She searches the Internet and finds an article predicting that the movements of Melancholia around Earth will bring the planets into a full-on collision soon afterward. Justine claims to possess a kind of special insight or intuition. She tells Claire that life on Earth is evil and that Melancholia is here to bring it all to an end.. .
Faced with the impending collision, Claire becomes distraught and suggests getting together on the terrace with wine and music. In response, a surprisingly calm and upbeat Justine dismisses her idea before going to comfort Claire's son, Leo. She makes him a protective magic teepee on the lawn of the estate. Justine, Claire and Leo enter the rickety wooden shelter as the planet Melancholia looms large. In the final seconds, a shockwave with fire overcomes the characters, destroying Earth, as shown in the introductory sequence.

http://en.wikipedia.org/wiki/Melancholia_(2011_film)