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Dr Chris Lintott finds out how British technology is leading the way in satellite science, while Sir Patrick Moore investigates the threat from space debris that astronauts face in space.
In his garden, Patrick Moore is joined by Dr Brian May and Jon Culshaw to watch the cosmic firework display known as the Perseid meteor shower.
Dr Chris Lintott travels to the Johnson Space Centre to talk to the Commander of Apollo 17, Eugene Cernan, about his memories of being the last man on the Moon in 1972. Patrick Moore looks at lunar samples brought back by the astronauts and talks to NASA scientists about what they discovered.