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NASA gave the green light Monday night for a Fourth of July shuttle liftoff despite worries about a piece of foam that popped off Discovery's external fuel tank while the spacecraft sat on the launch pad. The decision was sure to stir more debate about whether the space agency was putting its flight schedule ahead of safety. The 3-inch triangular piece of foam that appeared to come from a 5- inch-long crack late Sunday or early Monday is far smaller than the foam chunk that brought down Columbia, killing seven astronauts in But NASA managers spent most of Monday...

CAPE CANAVERAL, Fla. - Inspectors found a 5-inch-long crack in the foam insulation covering the shuttle Discovery's external fuel tank, and NASA managers were deciding Monday whether to call off the scheduled Fourth of July launch. The crack was spotted during an overnight inspection. NASA had scrubbed launch plans Saturday and Sunday because of poor weather and had removed fuel from the tank. The inspectors found the crack, which was an eighth of an inch deep, in the foam on a bracket near the top of the external fuel tank. "We don't know if it's a problem or not," NASA...

KENNEDY SPACE CENTER, Florida (CNN) -- Engineers on Monday are closely scrutinizing a small crack in insulation on space shuttle's fuel tank as NASA continues to prepare for a Tuesday launch. NASA deputy manager John Shannon said foam that cracked covers a bracket that connects the liquid oxygen feedline to shuttle Discovery's external fuel tank. When engineers went to inspect it, they pinched off a .0057-pound, 3- inch piece of foam. Even so, Shannon said, had that piece fallen off during launch it wouldn't have damaged the orbiter. The crack was discovered during an inspection Sunday evening, and is 4-...