(02/09/1999) --- In the Space Shuttle Main Engine Facility, the STS-93 crew poses in the nozzle of Space Shuttle Columbia's main engine. From left, they are Mission Specialist Michel Tognini of France, who represents the Centre National d'Etudes Spatiales (CNES), Commander Eileen Collins, Mission Specialist Catherine G. Coleman, Pilot Jeffrey S. Ashby, and Mission Specialist Steven A. Hawley. STS-93, scheduled to launch July 9 aboard Space Shuttle Columbia, has the primary mission of the deployment of the Chandra X-ray Observatory. Formerly called the Advanced X-ray Astrophysics Facility, Chandra comprises three major elements: the spacecraft, the science instrument module (SIM), and the world's most powerful X-ray telescope. Chandra will allow scientists from around the world to see previously invisible black holes and high-temperature gas clouds, giving the observatory the potential to rewrite the books on the structure and evolution of our universe