Interstellar Is Not About Space
On the face of it, Interstellar is the modern take on a space exploration film that is trying to “out-Kubrick” Kubrick, but the film, despite all its trappings is not about space. It is not even about physics or dimensions or time travel. Like most exquisitely good science fiction and adventure, it is about story, more than that it is about human interaction and provides enough in-depth character development for the the main players that the film never comes close to fitting the standard template for most cinematic science fiction films.
Mikes Film Talk 