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In the Space Shuttle Main Engine Facility, STS-93 crew members listen to Site Director Dan Hausman, with Rocketdyne, while looking over the main engine of the Space Shuttle Columbia. From left, they are Mission Specialist Steven A. Hawley, Commander Eileen Collins and Pilot Jeffrey S. Ashby. Other crew members (not shown) are Mission Specialist Michel Tognini of France, who represents the Centre National d'Etudes Spatiales (CNES), and Mission Specialist Catherine G. Coleman. 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