(CNN) -- Here's a look at what you need to know about the 1986 Space Shuttle Challenger disaster.
Facts: Seven crew members died in the explosion, including Christa McAuliffe, who would have been the first teacher in space.
The explosion was a result of a rocket booster failure which ignited the fuel tank.
Some of the objectives of Mission STS-51L included the "Comet Halley Active Monitoring Program" (CHAMP), a fluid dynamics experiment, and lesson plans and telecasts by Christa McAuliffe.
Timeline: April 4, 1983 - The Challenger's maiden voyage, STS-6. The Challenger completed nine successful missions between 1983 and 1986.
July 19, 1985 - New Hampshire teacher Christa McAuliffe is chosen to be the first teacher in space.
January 28, 1986 - The Space Shuttle Challenger explodes 73 seconds into flight at approximately 11:40 a.m. EST.
Crew: Francis R. (Dick) Scobee - Spacecraft Commander - Born on May 19, 1939 - Birth place - Cle Elum, Washington - Family - Wife June, and two children.
Michael J. Smith - Pilot - Born on April 30, 1945 - Birth place - Beaufort, North Carolina.
Judith A. Resnik - Mission Specialist - Born - April 5, 1949 - Birth place - Akron, Ohio
Ronald E. McNair - Mission Specialist - Born - October 21, 1950 - Birth place - Lake City, South Carolina, - Family - Wife, Cheryl, and two children.
Ellison S. Onizuka - Mission Specialist - Born - June 24, 1946 - Birth place - Kealakekua, Kona, Hawaii
Gregory B. Jarvis - Payload Specialist - Born - August 24, 1944 - Birth place - Detroit, Michigan - An engineer who worked for Hughes Aircraft Corp.
Christa McAuliffe - First teacher in space - Born - September 2, 1948 - Birth place - Framingham, Massachusetts