Researcher Rachel Trojahn prepares a global burst detector subsystem for a test in the flight test chamber at Sandia National Laboratories in Albuquerque, N.M., Aug. 4, 2016. The Global Burst Detection system, which was launched aboard the 70th Global Positioning System satellite, looks for nuclear detonations around the world, offering real-time information about potential activity to U.S. policymakers. Photo by Randy Montoya