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The Giotto spacecraft encountered Halley's Comet in 1986 and escaped. The same craft recently made close-range studies of the comet Grigg-Skellerup. Patrick Moore and Drjohn Mason are joined by Professor Susan McKenna-Lawlor to discuss the problems of comets.
Release date: 1992-07-20
Season number: 36
Episode number: 8
Runtime: minutes