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The Sky at Night

Stephen Hawking on Black Holes

Duration: 30 minutes

on BBC Four HD

How the detection of gravitational waves proves that black holes exist and provides a way to investigate them. Featuring a Stephen Hawking interview. 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.