What We Learned from Challenger and Columbia 2 years ago

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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

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