Stone with a fire extinguisher outside a space station? Magnificence.
The movie's final shot of Stone taking shaky steps back on Earth.
Pretty much the entire final half-hour of the movie from the hallucination scene to the credits. Once Stone decides she isn't going to die, she means it.
Meta-one for Alfonso and his team, for creating one of the best Sci-Fi movies in recent memory. The cinematography and visual effects are jaw-dropping (and absolutely must be seen in 3D), the soundtrack sets the mood perfectly, the actors give top-notch performances, and the direction is compelling and tense. It's been getting a lot of comparisons to 2001 and it deserves them. The critical praise has been universal (a perfect 48-for-48 positive reviews from Rotten Tomatoes' Top Critics, most of the 4-star variety), the movie pretty much shattered every October box office record (proving that you can open a big non-horror movie in that month, although it's plenty terrifying), and the strong word-of-mouth has helped the film to strong holds and a box office take surpassing the best of expectations.
It's also a long-time-coming financial success story for Cuaron, whose films have eluded mainstream box office success; his only prior film to crack $40 million domestically was sure-fire blockbuster Harry Potter and the Prisoner of Azkaban, and even that film had the weakest box-office performance of the entire series. Gravity's success ensures that Cuaron will have A-list resources and flexibility coming his way for whatever his next projects will be.
Plus garnering praise from the likes of Buzz Aldrin, Michael J. Massimino, and Garret Reisman.
When James Cameron says your film is the best space movie he's ever seen, you know you've done well.