CAPE CANAVERAL -- The space shuttle Discovery, its nosed pointed toward the sky, its belly attached to the massive, orange External Tank (ET) and twin Solid Rocket Boosters (SRB) slowly but surely emerged from the cavernous Vehicle Assembly Building at 7:24 pm EDT on Sept. 20. This marks the final time Discovery is scheduled to make the 3.4 - mile trip to Launch Complex 39A (LC39A) in preparation for her last planned mission -- STS-133.Bathed in spotlights Discovery's last rollout was a bittersweet moment for workers that have cared for the orbiter. Discovery was rolled out four hours earlier than normal so that workers could take pictures. Rollout is conducted in the evening hours to prevent potential damage from possible lightning strikes. The crawler-transporter moves at a blistering mile-an-hour, but despite this slow speed, the vehicle and its precious cargo create an amazing spectacle.Discovery is currently scheduled to lift off from LC39A on Nov. 1 at 4:40 pm EDT. Afterward Discovery will be maintained in flight ready condition in case the orbiter is needed to fly a possible rescue mission. After the end of the shuttle era, Discovery will go to the Smithsonian Air and Space Museum located in Washington DCThere are two crawler-transporters that NASA has used to transport spacecraft from the VAB to LC39A. They were originally used to transport the mighty Saturn family of rockets during the Apollo era. The crawler-transporters were designed by Bucyrus International ...