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Sources:
http://pdc.iaaweb.org/
http://iaaweb.org/iaa/Scientific%20Activity/pdcpr2019.pdf
https://cneos.jpl.nasa.gov/sentry/torino_scale.html
https://cneos.jpl.nasa.gov/pd/cs/pdc19/
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_pr1.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing1.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_pr2.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing2.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_pr3.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing3a.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing3b.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing3e.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_pr4.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing4a.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing4b.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing4c.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing5a.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing5b.pdf
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing5c.pdf
https://cneos.jpl.nasa.gov/sentry/
http://www.bbc.com/earth/story/20160706-in-siberia-in-1908-a-huge-explosion-came-out-of-nowhere
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Images:
https://www.videoblocks.com/video/3d-animation-of-asteroid-moving-toward-the-earth-gertny9
https://www.nasa.gov/image-feature/jpl/holiday-asteroid-flyby/
https://cneos.jpl.nasa.gov/sentry/torino_scale.html
https://commons.wikimedia.org/wiki/File:Torino_scale.svg
https://www.istockphoto.com/photo/earth-globe-realistic-3d-rendering-north-america-view-gm186020798-25142414
https://www.istockphoto.com/photo/planet-earth-with-some-clouds-europe-and-africa-view-gm186020792-25143827
https://cneos.jpl.nasa.gov/pd/cs/pdc19/pdc19_briefing2.pdf
https://www.istockphoto.com/vector/space-rocket-start-up-launch-symbol-innovation-development-technology-flat-design-gm923692330-253537625
https://www.istockphoto.com/vector/flame-meteorite-meteor-rain-fall-on-planet-in-cartoon-style-cataclysm-color-icon-gm961283432-262499046
https://commons.wikimedia.org/wiki/File:Tunguska_Ereignis.jpg
https://commons.wikimedia.org/wiki/File:Tunguska.png
https://commons.wikimedia.org/wiki/File:Tunguska_event_fallen_trees.jpg
https://www.videoblocks.com/video/asteroid-strike-over-earth-meteor-rain-elements-of-this-image-furnished-by-nasa-s9awxnmrlj1m3b7lw
https://images.nasa.gov/details-PIA18033.html