On this day in 1986, we lost the space shuttle Challenger and her crew.
The explosion occurred 73 seconds into the flight as a result of a leak in one of two Solid Rocket Boosters that ignited the main liquid fuel tank.
"I know it is hard to understand, but sometimes painful things like this happen," he said. "It's all part of the process of exploration and discovery. It's all part of taking a chance and expanding man's horizons. The future doesn't belong to the fainthearted; it belongs to the brave. The Challenger crew was pulling us into the future, and we'll continue to follow them." President Ronald Reagan