orbiter Columbia, aboard its orbiter transporter system, rolls toward
the opening in the Vehicle Assembly Building where it was mated with the
external tank mating in preparation for mission STS-93. The primary
mission objective was the deployment of the Advanced X-ray Astrophysics
Facility, renamed the Chandra X-Ray Observatory. Mission STS-93 was the
first led by a woman, Commander Eileen M. Collins.  The mission launched
on July 23, 1999.