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Horizon

Comet of the Century: A Horizon Special

Duration: 1 hour

on BBC Four HD

Once hoped to be the most spectacular comet in a generation, Horizon examines the insights Comet ISON might bring to some of science's greatest mysteries. Show more

BBC Four HD

About BBC Four

BBC Four reflects arts, music and culture with an ambitious range of intellectually and culturally enriching programmes, taking an expert and in-depth approach to its subjects.