Light and Dark

BBC Four

11:35 PM to 12:35 AM

Tuesday 27 October

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Part two of two. Professor Jim Al-Khalili visits the Gran Sasso National Laboratory in Italy, where scientists are attempting to capture and study dark matter. He also reveals how the discovery that the expansion of the universe is accelerating has led to theories that a mysterious new force called dark energy is in the process of gradually tearing the universe apart