One of the reasons I like hard science fiction is that it must justify scientifically, and in the most likely way possible, the technological and scientific development raised. To the point that more than novels, they seem biased essays. Try, for example, with Snow crash by Neal Stephenson. In the cinematographic field, however, there is no equivalent to hard science fiction. I suspect that it would not be profitable enough to invest in expensive special effects (that is why the most plausible films in science fiction barely contain F/X, as is the case with Primer).
That is, if we sit down to watch any science fiction movie with a specialist in the subject that is developed in that movie, we will probably have to press the “pause” every five minutes in order to explain to us why what we see is impossible. That is why I bring you this piece dedicated to gutting Gravity, because even for the most trained eyes it seems, a priori, a particularly well-kept feature film in the scientific aspect. But not even Gravity is saved. In Everything Wrong With Gravity – With Neil deGrasse Tyson (today celebrated thanks to the new Cosmos) presents 69 Gravity scientific errors, and there are still more.
As you have seen from the trailer, mission specialist Ryan Stone (Sandra Bullock) and Matt Kowalski (George Clooney) are working on the Hubble space telescope when it is brown and the space shuttle in which they had traveled to it is reached by a space junk cloud.
This causes both to be isolated from the shuttle and floating in space, although fortunately, Kowalski carries a jetpack that allows him to go for Stone and then head to the Explorer after picking up the corpse of the third astronaut who was participating in the spacewalk.
Only when they get there they discover that the Explorer has been seriously damaged and their other two dead crew members – their corpses, of course, appear by surprise to give the usual scare – with what they only have left to go to the International Space Station using Kowalski’s propeller backpack.
Of course, when you get there, the thing becomes brown again and, as is rigorous in a movie in which a group is isolated, one of them has to sacrifice for the other, so that from that moment the film will converts, as @carolizandra said in “Sandra and a series of catastrophic misfortunes” while Stone tries to return to Earth. The problem for me, as a deep and confessed spaciotrastornado, is that from the zero minutes of the movie I didn’t believe anything.