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KENNEDY SPACE CENTER, FLA. -- In the high bay at Astrotech Space Operations, the upper cylindrical canister is lowered toward the THEMIS spacecraft and upper stage booster below. When the upper and lower canisters are joined, the THEMIS will be completely enclosed and will be transported to Launch Complex 17-B for mating with its launch vehicle. THEMIS consists of five identical probes, the largest number of scientific satellites ever launched into orbit aboard a single rocket. This unique constellation of satellites will resolve the tantalizing mystery of what causes the spectacular sudden…