NuSTAR space telescope construction. Engineers in the final stages of mating NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) to its carrier rocket. NuSTAR is NASA's 11th small-explorer mission (SMEX-11) and is a space-based X-ray telescope that will use a Wolter telescope to focus high energy X-rays from astrophysical sources, especially for nuclear (gamma-ray) spectroscopy. It was built by Orbital Sciences Corporation and launched on 13th June 2012. Photographed at Vandenberg Air Force Base's processing facility, California, USA, on 23rd February 2012.
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