History: 30 Years Ago Today - STS-51-L was the tenth and final mission for the Space Shuttle Challenger [3000x2400]

https://upload.wikimedia.org/wikipedia/commons/8/81/STS-51-L.jpg via /r/HistoryPorn http://www.reddit.com/r/HistoryPorn/comments/4346cz/30_years_ago_today_sts51l_was_the_tenth_and_final/