Many people wanted to know why the "Challenger" exploded. President Ronald Reagan asked for a report about the disaster. It was called the "Rogers Commission Report" and it was written by a group of astronauts, scientists and engineers. They worked out what had happened and why the "Challenger" exploded. The report said that the people in charge at NASA did not listen to the engineers who said the O-rings were not safe; and that sometimes the people in charge thought that parts of the shuttle were well made when they were not. They also wrote that NASA sometimes did unsafe things because people would get angry if the shuttle launches were delayed. 