Posted: Tue, Mar 14, 2006, 6:41 AM ET (1141 GMT)

NASA has postponed the launch of three experimental microsatellites because of poor weather. A Pegasus XL, deployed from a carrier aircraft flying out of Vandenberg Air Force Base in California, was scheduled to launch the three Space Technology 5 (ST5) microsatellites Tuesday morning. However, NASA postponed the launch because of poor weather forecast for the area. The launch has been rescheduled for Wednesday at 9:02 am EST (1402 GMT), but the forecast calls for only a 20 percent chance of acceptable weather then. The three ST5 satellites are designed to test a number of spacecraft technologies while performing measurements of the Earth's magnetosphere.