Roger Penrose talks to us about the nature of time and his cyclic universe model.

Time is a problem, not just for you and me, but also for philosophers. What exactly is time? Why does it have a direction? And was there a beginning of time? In this podcast philosophers of physics Jeremy Butterfield and David Wallace, as well as the eminent Roger Penrose talk about the puzzle time poses, and what it has to do with the Big Bang and thermodynamics.

There is more about the nature of time in the Plus article What is time?, and you can find out more about Roger Penrose's cyclic universe model, which he talks about in this podcast, in his book Cycles of time.

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