May be some other Jovian moon. Apparently they make some incredible discovery and then the typical Hollywood plot line ensues.
Could be the movie Europa Report
Dr. Unger (Embeth Davidtz), CEO of Europa Ventures, narrates the story of the Europa One mission. Six astronauts embark on a privately funded mission to Europa, one of the moons of Jupiter, to find potential sources of life. The crew members are Captain Willam Xu (Daniel Wu), pilot Rosa Dasque (Anamaria Marinca), chief science officer Daniel Luxembourg (Christian Camargo), marine biology science officer Katya Petrovna (Karolina Wydra), junior engineer James Corrigan (Sharlto Copley), and chief engineer Andrei Blok (Michael Nyqvist).
If it's not Europa, then could it be Titan? That would make it Oblivion starring Tom Cruise. http://en.wikipedia.org/wiki/Oblivion_%282013_film%29