Centuries ago, the work of Edmond Halley demonstrated to the world that comets were not evil omens as many superstitious Europeans believed but celestial bodies in outer space. Even so, comets and asteroids could pose a direct threat to all life on Earth. The real question is whether humanity has the tools to meet that threat?If you would like to make a contribution to the program, click this link: https://www.patreon.com/universeuniversity?fbclid=IwAR0GJjAwa3C1f8KKxDi7aeGVEO-Ou3dL10vmf1kQHjssQu5eEgmCkyNFMgwPHOTO CAPTION: Comet Lovejoy near the constellation Ursa MajorNASA/MSFC/Jacobs Technology/ESSSA/Aaron KingeryREFERENCES:'Edmond Halley: Charting the Heavens and the Seas'by Alan Cook 'The Day the Mesozoic Died: How the Story of the Dinosaurs' Demise was Uncovered'by Sean B. Carrol http://nautil.us/issue/32/space/the-day-the-mesozoic-died 'Ernst Florens Friedrich Chladni (1756-1827) and the origins of modern meteorite research'by Ursula B. Marvin 'Asteroid Apocalypse? Why Scientists Worry About 2036 'Planet Buster'. Newsweek.comby Michio Kaku https://www.newsweek.com/asteroid-apocalypse-why-scientists-worry-about-2036-planet-buster-63395'Double Asteroid Redirection Test (DART) Mission', NASA.govhttps://www.nasa.gov/planetarydefense/dartMUSIC:"Shores of Avalon" Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 3.0 Licensehttp://creativecommons.org/licenses/by/3.0/"Perspectives" Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 3.0 Licensehttp://creativecommons.org/licenses/by/3.0/"Infinite Perspective" Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 3.0 Licensehttp://creativecommons.org/licenses/by/3.0/"Ossuary 1: A Begining" Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 3.0 Licensehttp://creativecommons.org/licenses/by/3.0/"Ossuary 6: Air" Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 3.0 Licensehttp://creativecommons.org/licenses/by/3.0/