NASA postponed Friday's launch of the space shuttle Atlantis, this time because of a problem that has bedeviled the space agency before: a faulty fuel tank sensor.
The launch was rescheduled for 11:15 a.m. EDT (1515 GMT) on Saturday, when NASA will try a fourth time to get Atlantis off the ground.
Previous attempts over the past 12 days were dashed by a lightning bolt that struck the launch pad, Tropical Storm Ernesto and a fuel cell coolant pump that gave an erratic reading.
This time, a sensor in the hydrogen fuel tank gave an abnormal reading during a test as the shuttle was being fueled early Friday.
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