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Secrets of Size: Atoms to Supergalaxies Series 1 Episodes

  1. Tuesday 23:20
    BBC Four

    Going Small

    1/2 Jim Al-Khalili explores the universe at its smallest, from tiny insects to atoms. (R)

  2. Next Wednesday 02:20
    BBC Four

    Going Small

    1/2 Jim Al-Khalili explores the universe at its smallest, from tiny insects to atoms. (R)

  3. Tue 10 Nov 2026 23:30
    BBC Four

    Going Big

    2/2 From our world to the edge of space, Jim Al-Khalili explores the vastness of the cosmos. (R)

  4. Wed 11 Nov 2026 02:55
    BBC Four

    Going Big

    2/2 From our world to the edge of space, Jim Al-Khalili explores the vastness of the cosmos. (R)