Sir Patrick Moore charts the development of the telescope over four centuries and fasts forward to meet the astronaut who repaired the Hubble Space Telescope. Dr Chris Lintott visits some modern day astronomical leviathans.

Saturn's mysterious moon Enceladus has startled astronomers with its amazing ice geysers, which spew out material into space. Sir Patrick Moore talks to the scientists who are trying to unlock the secrets of this tiny world.

Dr Chris Lintott visits the Open University to find out the latest on our own Moon. He meets scientists from the Japanese Kaguya mission and the Indian Chandrayaan mission, with its British instrument CIXS.