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What space-research technology was used in 1985 to study the passing Comet Halley?

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Japan, the European Space Agency, and the USSR sent spacecraft to study the comet; the Vega and Giotto probes revealed a darker-than-expected nucleus 8 km (5 mi) wide and 15 km (9 mi) long, and shaped like a potato.

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Get more facts and information about Halleys comet . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

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