What We Learned from Challenger and Columbia

Late January and early February are the anniversaries of two of the most disastrous events in the history of spaceflight. What did we learn from these events, and how do we move forward?

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Sources:
http://engineer.jpl.nasa.gov/practices/1257.pdf
http://science.ksc.nasa.gov/shuttle/missions/51-l/docs/rogers-commission/Appendix-F.txt
http://science.ksc.nasa.gov/shuttle/missions/51-l/docs/rogers-commission/table-of-contents.html
http://www.nbcnews.com/id/11031097/ns/technology_and_science-space/t/myths-about-challenger-shuttle-disaster/#.VrA2efkrKhd
http://www.popularmechanics.com/space/a18616/an-oral-history-of-the-space-shuttle-challenger-disaster/
http://er.jsc.nasa.gov/seh/explode.html
http://articles.latimes.com/2003/feb/06/science/sci-tiles6
http://www.space.com/19526-columbia-shuttle-disaster-explained-infographic.html
http://www.space.com/19403-nasa-space-shuttle-columbia-disaster-questions.html
http://www.space.com/19436-columbia-disaster.html

Image Sources:
https://commons.wikimedia.org/wiki/File:Challenger_flight_51-l_crew.jpg
https://commons.wikimedia.org/wiki/File:STS-51-L_grey_smoke_on_SRB.jpg
https://en.wikipedia.org/wiki/Space_Shuttle_Challenger_disaster#/media/File:Icicles_on_the_Launch_Tower_-_GPN-2000-001348.jpg
https://commons.wikimedia.org/wiki/File:RogersCommission-v1p57.jpg
https://en.wikipedia.org/wiki/Space_Shuttle_Columbia_disaster#/media/File:Crew_of_STS-107,_official_photo.jpg
https://commons.wikimedia.org/wiki/File:Space_Shuttle_external_tank_foam_block.JPG
https://commons.wikimedia.org/wiki/File:Impact-test.jpg
https://commons.wikimedia.org/wiki/Category:Space_Shuttle_Columbia_disaster#/media/File:Columbia_debris_detected_by_radar.jpg
https://commons.wikimedia.org/wiki/File:Soyuz_TMA-19_docked_to_the_Rassvet_Mini-Research_Module.jpg
https://en.wikipedia.org/wiki/Hubble_Space_Telescope#/media/File:STS-31_Hubble_launch_roll_and_pitch.jpg
https://en.wikipedia.org/wiki/Hubble_Space_Telescope#/media/File:Upgrading_Hubble_during_SM1.jpg
https://en.wikipedia.org/wiki/Spacecraft
https://en.wikipedia.org/wiki/Dragon_V2#/media/File:Dragon_2_hover_test_(24159153709).jpg
https://commons.wikimedia.org/wiki/File:Orion_Drop_Test_on_Feb_29.jpg

Видео What We Learned from Challenger and Columbia канала SciShow Space