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? https://brilliant.org/astrum/ ************** A big thank you to Brilliant for supporting this video. Sign up for free using the link above. That link will also get the first 200 subscribers 20% off a premium subscription to the website if you like what you see. ************** Looking for the Astrum Hindi Channel? https://www.youtube.com/channel/UC0Y6f4dDY4ORnXoL1NAUw-w SUBSCRIBE for more videos about our other planets. Subscribe! http://goo.gl/WX4iMN Facebook! http://goo.gl/uaOlWW Twitter! http://goo.gl/VCfejs Donate! Patreon: http://goo.gl/GGA5xT Ethereum Wallet: 0x5F8cf793962ae8Df4Cba017E7A6159a104744038 Become a Patron today and support Astrum! Donate link above. I can't do it without you. Patreons can help pick the next Astrum Answers in a fortnightly poll. Thanks to those who have supported so far! Image Credits: NASA/ESO/ESA/ISAS/VEGA Music Credits: Stellardrone - Cepheid Stellardrone - Billions and Billions