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In the Vertical Processing Facility, the Chandra X-ray Observatory is lowered toward the Inertial Upper Stage (IUS) in a workstand beneath it. There it will be mated with the IUS and then undergo testing to validate the IUS/Chandra connections and to check the orbiter avionics interfaces. Following that, an end- to-end test (ETE) will be conducted to verify the communications path to Chandra, commanding it as if it were in space. With 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. Chandra is scheduled for launch July 22 aboard Space Shuttle Columbia, on mission STS-93.