Video: 31 years since Challenger tragedy

The crew of Space Shuttle mission STS 41-B provide an overview of their mission. Challenger launched from the Kennedy Space Center on February 3, 1984, and although the flight was marred by the failure of two commercial satellite deployments, astronaut Bruce McCandless made history by making the first untethered spacewalk using the Manned Maneuvering Unit jet pack.

A NASA video on the investigation into the Challenger accident of January 28, 1986. The video was created by the STS 51-L Data and Design Analysis Task Force which contributed to the Presidential Commission that investigated the tragedy. (Membership required)

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.