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Does space go on for ever? Are there infinitely many stars? For most of us, looking up at the stars gives us a sense of infinity but, as Adrian Moore discovers, there is a strong body of opinion which suggests that space is finite, albeit unbounded. This is a difficult idea to grasp, but by inviting us to think of ourselves as ants, astrophysics professor Jo Dunkley attempts explain it. First broadcast on A History of the Infinite, 28 September 2016.