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Episode 2
Dara and Brian's journey through the night sky continues with a look at black holes, the most mysterious and destructive objects in the whole universe. Liz Bonnin finds out how our galaxy the Milky Way was formed and Mark Thompson investigates the problems that are caused by light pollution.
Aired: Jan 17, 2012 Genre: DocumentaryCasts: Brian Cox Liz Bonnin Dara Ó BriainDuration: 1h Rating: 0 Country: United Kingdom Production: BBC