Sir Patrick Moore, with the help of Pete Lawrence and the latest pictures, investigates the longest total eclipse of the sun for many years, which took place in India and China in July 2009. In orbit around Saturn, the Cassini probe has sent back amazing new images, and there's a new discovery on the moon Enceladus. Chris Lintott reports from the latest Cassini conference in London and finds out why there is a sprinkling of table salt in the rings of Saturn