(By Clara Moskowitz, FoxNews.com) - NASA commemorated three space tragedies this week, which also marked the 25th anniversary of the shuttle Challenger accident that killed seven astronauts. The space agency also paused to remember the 2003 loss of the shuttle Columbia and its crew and the earlier Apollo 1 fire that killed three astronauts.
The explosion as seen live on CNN:
Rarely seen home video of the explosion from a different angle:
President Reagan addresses the nation: