Whenever there's a new Christopher Nolan film out you know the closing credits aren't the end of the experience. Dissection of the themes and theorising over its high concepts are all part of the fun. And that's certainly the case with Interstellar, Nolan's latest, which has set the internet alight over the past weekend, although quite in the way we're accustomed to. Unlike Inception or Memento, Interstellar's story is tightly wrapped up by the end with little ambiguity, most of its overarching elements explained explicitly. But that doesn't means there's not some dangling questions that remain unanswered. Today we're going to look at ten of those lingering musings about the film, whether it's concepts shrouded in ambiguity or plot threads still dangling. Naturally spoilers abound from here on in. One question on many people's lips is that, with Cooper influencing his daughter and past self and future humans helping their less-evolved kin, surely there's a big paradox here. How can he go to NASA if he himself needs to tell him to go to NASA? This is a common issue with movies that treat time as a closed, unbreakable loop, but is really more logical than Marty McFly simply fading out of existence - imagine jumping about on a straight line. See The Terminator or 12 Monkeys for more big screen examples of the similar method of time travel. And with that out of the way, let's get on to the ten remaining questions.