Video: 31 years since Challenger tragedy

On the 30th anniversary of the Challenger disaster, crew families, friends and space workers gathered Thursday to remember the 17 men and women who lost their lives on the high frontier, 14 in two space shuttle disasters and three in an Apollo-era launch pad fire 49 years ago Wednesday.

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)