A standard post-takeoff checkup of the space shuttle Atlantis uncovered a four-inch gap in its thermal blanket. Mission control believed the gap appears to be the result of an unusual fold in the blanket.
Managers have added two more days and an extra spacewalk to the original 11-day mission to repair the damage.
Astronauts hope to add a new section to the International Space Station, unfurl new solar arrays, retract an older array, and pick up a new passenger to return to Earth.
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