The Space Shuttle Challenger Accident Investigation

This narrated footage shows the preparations that shuttle Atlantis and the mission payloads underwent at Kennedy Space Center for launch on STS-135 to the International Space Station.

In the first memorial of its kind, NASA and the families of the 14 men and women who lost their lives aboard the shuttle Challenger in 1986 and Columbia in 2003 have joined together to remember the astronauts with pictures, personal mementos and, in an emotional first, iconic wreckage from both orbiters.

VIDEO: The winged spaceship Columbia returned to Earth with a pinpoint landing at Edwards Air Force Base on this day 35 years ago, concluding the maiden flight of the space shuttle.