The three main engines on space shuttle Discovery will be configured today so the spacecraft can be taken to the Vehicle Assembly Building on Sept. 8 for stacking. Discovery, the oldest active shuttle, is being prepared for the STS-133 mission. Liftoff is targeted for Nov. 1. The preferred launch time for Nov.1 would be 4:40 p.m. Eastern time. The crew is involved in robotic proficiency training today at NASA’s Johnson Space Center in Houston.