The space shuttle Discovery crew examined damage to the craft's heat shield with laser scanners on Friday while NASA's chief on the ground expected engineers would quickly fix the fuel tank problems that have again grounded the fleet.
During Discovery's launch on Tuesday on NASA's first shuttle mission since the 2003 Columbia disaster, a chunk of foam nearly as large as the one responsible for downing Columbia fell off Discovery's fuel tank. A smaller chunk of foam also broke off and is believed to have hit Discovery's wing, but did not cause any damage, deputy program manager Wayne Hale said.
Columbia was destroyed because a 1.67-pound (0.75-kg) chunk of falling insulating foam damaged heat panels on the ship's left wing, allowing superheated gases to blast into the structure as the shuttle flew through the atmosphere for landing on Feb. 1, 2003. Seven astronauts died when Columbia broke up over Texas.
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