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KENNEDY SPACE CENTER, FLA. -- In high bay 1 of the Vehicle Assembly Building, work is underway to repair the damage to Atlantis' external tank, seen here. Technicians will prepare the nose cone for future work. A severe thunderstorm with golf ball-sized hail caused visible divots in the giant tank's foam insulation and minor surface damage to about 26 heat shield tiles on the shuttle's left wing. Further evaluation of the tank is necessary to get an accurate accounting of foam damage and determine the type of repair required and the time needed for that work. A new target launch date has not been determined, but teams will focus on preparing Atlantis for liftoff in late April on mission STS-117. Photo credit: NASA/George Shelton