 Complete the following phrase:  During the lift-off of STS-107 on January 16, 2003, a piece of foam insulation detached from one of the tanks bipod ramps and struck the leading edge of s wing at a few hundred miles per hour. The impact is believed to have damaged one comparatively large reinforced carbon-carbon panel on the leading edge of the left wing, believed to be about the size of a basketball which then allowed super-heated gas to enter the wing superstructure several days later during re-entry. This resulted in the 