The Halley Armada, Giotto, Vega 1 and 2, Suisei and Sakigake, all visited Halley's Comet at roughly the same time in 1986. What did they discover? Why was this such a groundbreaking mission?
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Image Credits: NASA/ESO/ESA/ISAS/VEGA

Music Credits:
Stellardrone - Cepheid
Stellardrone - Billions and Billions