In 1986 two Soviet space probes intercepted Halley's Comet during its first visit to Earth in 76 years. Hear from the man in charge of the mission, physicist Roald Sagdeev. Show more
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In 1986 two Soviet space probes intercepted Halley's Comet during its first visit to Earth in 76 years. Hear from the man in charge of the mission, physicist Roald Sagdeev. Show more
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