Workers help set up the KSC payload canister transporter as it waits in the Vertical Processing Facility to retrieve the Chandra X-ray Observatory.

Workers help set up the KSC payload canister transporter as it waits in the Vertical Processing Facility to retrieve the Chandra X-ray Observatory and carry it out to Launch Pad 39B. Chandra is scheduled to launch no earlier than July 20 at 12:36 a.m. EDT aboard Space Shuttle Columbia, on mission STS-93. 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