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And then there was the Hubble optics debacle, which cost way more to fix, and then the extra shuttle service flight to install the new optical system. The shuttle solid fuel booster "O" ring issue which led to the loss of an entire shuttle crew and set the program back for years. These are only the ones we hear about. I am sure the "redo" totals are significant every year, and the larger the project the more contingency (time and money) is required. I have to wonder what is lurking in the James Webb Space Telescope program.
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