The Sky at Night — Episode 12: The 'Clocks' of Space

You are watching the episode The 'Clocks' of Space Radio-astronomers at Jodrell Bank are carrying out a series of remarkable experiments to measure the distance from earth of 'pulsars'-the mysterious regularly-ticking radio sources out in space which were discovered last year by British scientists. Patrick Moore discusses the significance of these experiments with Dr. Gerhard de Jager at Jodrell Bank