The series on the history of the solar system continues.
For centuries human beings struggled to understand the origins of the Moon. But even after 20 years of lunar exploration, scientists were still in the dark. Then an astronomer from Arizona came up with a solution to the riddle.
See today's choices.
(Digital widescreen)
CD: The Planets soundtrack is available now on BBC Music label
Reader Offer: buy the BBC hardback book The Planets, for only £17.99. inclusive of P&P; (rrp £19.99). To order call [number removed] or send a cheque. payable to RT Offers, to [address removed]
Everyone's gone to the Moon: p7