At Astrotech Space Operations a worker prepares the THEMIS spacecraft for black white light inspection.

At Astrotech Space Operations, a worker prepares the THEMIS spacecraft for black/white light inspection. White light inspection assures the telemetry is operating. Black light inspection uses UVA fluorescence to detect possible particulate microcontamination, minute cracks or fluid leaks. 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 brightening of the aurora borealis and aurora australis - the fiery skies over the Earth's northern and southern polar regions. THEMIS is scheduled to launch Feb. 15 from Cape Canaveral Air Force Station. Photo credit: NASA/George Shelton