It's not the visuals. Awesome astronaut Chris Hadfield told Conan that Alfonso Cuaron's Gravity perfectly captured the spectacular beauty of space. This is a man who actually spacewalked, people! We gotta trust his opinion since we'll probably never see space. But one thing that wasn't realistic? Sandra Bullock's underwear.
You see, Hadfield said that after making a spacewalk his underwear would be this unsightly long white thing that would be completely drenched in sweat. His hair would look more like rat fur and he would actually be wearing these Depends-type adult diaper too. Yeah, that doesn't sound all that visually appealing.