A hailstorm caused more than 1,000 indentations in the foam insulation of the shuttle's large external fuel tank.
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The 5.5-kilometer trip to the hanger took about seven hours Sunday. The NASA space agency says the up-close look will allow engineers to determine how long repairs will take.
Atlantis had been scheduled for a March 15 launch for another construction mission to the International Space Station.
NASA says the mission's crew will continue to train in Houston as they await a new launch date.
Some information for this report was provided by AP and Reuters.