The '''Space Shuttle Challenger''' exploded 73 seconds after lift-off on January 28, 1986, killing all seven members on board. Those killed included the first private citizen to fly on a [[space shuttle]], who was a high school teacher. | The '''Space Shuttle Challenger''' exploded 73 seconds after lift-off on January 28, 1986, killing all seven members on board. Those killed included the first private citizen to fly on a [[space shuttle]], who was a high school teacher. |