A detailed laser inspection on Sunday of the difficult-to-reach area on Endeavour's belly could send astronauts out to repair the 3-inch wound later in the week, although NASA said that prospect appeared less likely than it did a day earlier. A penetration, if severe enough, could let in searing gases when the shuttle returns to Earth in a possible replay of the Columbia accident.
As a pair of spacewalking astronauts installed a new beam to the international space station on Saturday, engineers back on Earth scrutinized images of the gouge, the result of a strike by fuel-tank foam insulation at launch.
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