NASA's Space Shuttle Challenger crew members in an undated handout photo taken at Johnson Space Center in Houston, Texas. Left to right: Mission Specialist Ellison S. Onizuka, Pilot Mike Smith, Teacher in Space Christa McAuliffe, Commander Dick Scobee, Payload Specialist Greg Jarvis, Mission Specialist Ron McNair and Mission Specialist Judy Resnik.
The NASA lost seven of its own on the morning of Jan. 28, 1986, when a booster engine failed, causing the Shuttle Challenger to break apart just 73 seconds after launch. (Reuters)