Technicians prepare to roll the Orbital Sciences Pegasus XL rocket with its NuSTAR spacecraft to the waiting aircraft.

Technicians prepare to roll the Orbital Sciences Pegasus XL rocket with its NuSTAR spacecraft to the waiting L-1011 carrier aircraft known as "Stargazer." The Pegasus will launch NuSTAR into space where the high-energy x-ray telescope will conduct a census for black holes, map radioactive material in young supernovae remnants, and study the origins of cosmic rays and the extreme physics around collapsed stars. Photo credit: NASA/Randy Beaudoin, VAFB