Stacked with its solid rocket boosters and external fuel tank on the mobile launcher platform, space shuttle Discovery continues its slow roll atop a crawler-transporter, headed for Launch Pad 39A at NASA’s Kennedy Space Center in Florida. The shuttle began its 3.4-mile journey from the Vehicle Assembly Building around sunset, departing the mammoth building at 7:23 p.m. EDT. The trip to the pad should take about six hours. Live coverage on NASA TV and on the Web at www.nasa.gov/ntv will resume at 7:10 a.m. EDT tomorrow.