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Episode 3

Episode 5 of 6

Dara and Brian's journey through the night sky concludes with a look at aliens, extra terrestrial life and the hunt for new worlds. Mark Thompson tackles light pollution.

On the final night of their astronomical adventure, Prof Brian Cox and Dara O Briain discuss aliens, extra terrestrial life and the hunt for new worlds far outside our solar system. They also find out if they've been successful in their quest to find their own Stargazing planet.

Meanwhile, Mark Thompson attempts to tackle light pollution by getting the entire population of a small town to switch off all of their lights.

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59 minutes