Well, yeah. ...
You've got small shards of George Clooney and Sandra Bullock here and there, but really. The flick is 80+% created by the usual animation suspects, in the usual black boxes. And also, too, by lighters and riggers and surfacers. And all the other artists, designers and techinicians that you see in your run-of-the-mill animation studio.
Because if you haven't been asleep on a beach in Samoa the last twenty years, you've probably noticed that Cartoonland has been bleeding into live-action movies for decades, at a faster and faster clip. And now, in 2013, the line is increasingly blurry.
Run your eyeballs down any box office list, and you'll find a Frozen, a Despicable Me, but you'll also find a super hero epic or a Peter Jackson film that has a poopload of dress extras, dragons, or twirling objects from outer space in it. And all those things were created and brought to life by overworked, underpaid artists who've spent years on the job and in the classroom learning their 21st century art.
So is Gravity animated? Like the features coming out of Disney, Illumination Entertainment, DreamWorks and Blue Sky Animation Studios?
Bet your ass.