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KENNEDY SPACE CENTER, FLA. -- The first stage of a United Launch Alliance Delta II rocket arrives at the mobile service tower on Launch Pad 17-B at Cape Canaveral Air Force Station in Florida. The rocket is the launch vehicle for the THEMIS spacecraft, consisting 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 brightening of the aurora borealis and aurora australis - the fiery skies over the Earth's northern a…
