The orbiter Columbia aboard its orbiter transporter system makes the turn from the Orbiter Processing Facility.

The orbiter Columbia, aboard its orbiter transporter system, makes the turn from the Orbiter Processing Facility (behind it, left) to the nearby Vehicle Assembly Building (VAB) for external tank mating operations. Columbia is scheduled for rollout to Launch Pad 39B on Monday, June 7, for mission STS-93. The primary mission objective will be the deployment of the Advanced X-ray Astrophysics Facility, recently renamed the Chandra X-Ray Observatory. Mission STS-93 will be the first Space Shuttle commanded by a woman, Commander Eileen M. Collins. It is scheduled to launch July 22 at 12:27 a.m. EDT although that date is currently under review