Gravity, with Sandra Bullock in the lead role and George Clooney supporting, is an excellent movie for fans of science fiction, but as SF author Rosemary Kirstein points out (and beware spoilers behind that link), it is more science fact than science fiction. Though the events are fictional, the technology underpinning them is not. We have multiple space stations in orbit. We have people who work in space on a regular basis, if not continually. We have taken science fiction, and made it real. We have Star Trek communicators, Star Trek tricorders. We are working on self-driving cars (not quite ready yet!) and invisibility cloaks. We're doing all that with science, and this movie sticks reasonably close to what we know about science.