Los Angeles Times: The space shuttle Endeavour and its six-member crew were poised to embark on their final mission Friday afternoon when NASA officials delayed the launch until Monday at the earliest because of a problem with one of the spaceship's power units. NASA made the announcement at about 9:20 a.m. PDT, roughly three hours before the designated launch. At that time, Endeavour had been loaded with a half-million gallons of rocket fuel on launch pad 39A at Kennedy Space Center in Cape Canaveral, Fla.