It was on this day in 1986 the space shuttle exploded 73 seconds after launching.
Here is CNN coverage from 11:00-12:00 on that day. Live coverage of the shuttle begins at approximately the 34 minute mark. However I found the whole hour fascinating to watch.
This, naturally, leads into my all time favorite Reagan moment;
Francis R. Scobee, Commander
Michael J. Smith, Pilot
Ronald McNair, Mission Specialist
Ellison Onizuka, Mission Specialist
Judith Resnik, Mission Specialist
Greg Jarvis, Payload Specialist
Christa McAuliffe, Payload Specialist