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well thankfully NASA has decided to replace the external tank on the shuttle. The old one had cracks found in it. I didn't think they were going to replace it, as they had already rolled the shuttle out to the launch pad, but they brought it back in a few days ago, to be refitted. Launch date is still set for last two weeks of july, but if they find more probs when replacing the tank, it will probably get pushed back again. The new tank is supposed to have better heating to reduce ice build up.
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