Today marks the 25th anniversary of the Challenger disaster.
Chris Gebhardt has posted this history of Shuttle Challenger: 1983-1986: The Missions and History of Space Shuttle Challenger – NASASpaceFlight.com.
Miles O’Brien recounts the events of that day in The big “Y”.
On the SpaceflightNow video page there will be “a live special webcast hosted by Miles O’Brien from the Challenger Learning Center in Houston at 1:30 p.m. EST (1830 GMT).”
See spacetoday.net for many links to articles in the media today about the tragedy.