A Close Encounter of the Second Kind

This Horizon special program explores what happened when the "Giotto" explorer spacecraft passed within 100 kilometres of Halley's Comet.

English

Originally Aired July 10, 1992
Runtime 60 minutes
Special Position Airs after season 1992
Content Rating United States of America TV-PG
Network BBC Two
Created February 10, 2020 by
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Modified February 10, 2020 by
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