The Sky at Night with Patrick Moore started on 24 April 1957. In tonight's special edition, Patrick Moore looks back, with Commander Henry Hatfield, at the astonishing changes and advances in astronomical knowledge since 1957. He discusses recent developments in 'invisible astronomy' with Professor Anthony Hewish, whose team discovered the first pulsar, and with infra-red astronomer Professor Jim Ring. Finally, he looks forward to the discoveries we can expect in the next 15 years.