NASA Dismisses Foam Theory NASA officials back away from the theory that a piece of foam insulation, dislodged during Columbia's liftoff, caused the space shuttle's disintegration upon re-entry Feb. 1. As NASA continues its probe, engineers draw on risk assessments done after the 1986 Challenger explosion. Hear NPR's Richard Harris and NPR's Christopher Joyce.

NASA Dismisses Foam Damage Theory

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NASA officials back away from the theory that a piece of foam insulation, dislodged during Columbia's liftoff, caused the space shuttle's disintegration upon re-entry Feb. 1. As NASA continues its probe, engineers draw on risk assessments done after the 1986 Challenger explosion. Hear NPR's Richard Harris and NPR's Christopher Joyce.

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