Main content
The Science of Doctor Who Clips
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Black holes and event horizons (pt 2/2)
Duration: 07:29
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The nature of light
Duration: 06:35
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Are we alone in the universe?
Duration: 07:13
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Black holes and event horizons (pt 1/2)
Duration: 06:11
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Special relativity and the constant speed of light
Duration: 05:56
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Brian Cox tests the Doctor
Duration: 01:09
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The Science of Doctor Who: Trail
Duration: 00:25