The series on the history of the solar system continues.
Although there is a volcano on Mars, and Venus has giant plains of frozen lava, for many years it seemed that the planets' surfaces were geologically dead. But at the end of the seventies, living volcanoes spitting boiling sulphur, ice and frozen nitrogen were found on the moons of Jupiter and Neptune.
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]
