Rescue Scenarios
Follow, day by day, how a high-risk effort to save Columbia's crew in space might have unfolded.

The Investigator
Scott Hubbard, a veteran leader of space missions, fought denial with hard evidence to convince NASA of the accident's cause.

The Insider Who Knew
NASA engineer Rodney Rocha, whose warnings and calls for action went unheeded, speaks out about the disaster.

Force of Impact
How could a lightweight piece of debris cause catastrophic damage? Find out in this simulation of the shuttle's launch.

The Case to Save the Shuttle Program
Allen Richardson, 30 years in Boeing's space operations, offers arguments for continuing shuttle missions beyond 2010.

A Space Age Controversy
Aerospace expert John Logsdon makes the case to retire the shuttle.