O Telegraph explorou algumas das ciências do Interstellar:
Miller’s planet is as close to the huge black hole Gargantua as it can be without getting sucked in.
[...]
The crew of Interstellar’s Endurance spaceship faced a headache when trying to get to Miller’s planet because it is trapped within the control of the huge black hole Gargantua.
To avoid being sucked into the black hole, the spaceship had to be travelling at high speed to escape the huge gravitational and centrifugal forces.
In Interstellar, Cooper gets round his speed dilemma by slingshotting around a the black hole.
[...]
However the speed needed to escape something as massive as Gargantua is huge. The Endurance would need to be travelling at close to the speed of light to escape the huge pull of the black hole, and then quickly slow down so it could land on the planet. The sudden change in momentum would almost certainly tear the ship apart.
Há uma pergunta semelhante sobre Science Fiction & Troca de pilha de fantasia . Ele foi fechado por estar fora do tópico, mas tem uma resposta sobre buracos negros em geral.
Há outra pergunta sobre o SF & F SE onde a resposta contém algumas informações relevantes. Ele cita informações de The Science of Interstellar pelo físico Kip Thorne (que foi consultor do filme, e co-escreveu o script original de tratamento) ):
As for how they manage to navigate from one orbit to another, Thorne discusses this in chapter 7. Basically his answer is that although their rockets alone wouldn't be sufficient, they use gravitational slingshots past other massive objects in orbit around Gargantua, including smaller black holes and neutron stars.
Há um longo trecho que explica muito isso em detalhes.