Foto de stock - 07/24/1997 ___ Applied Physics Laboratory engineers and technicians from Johns Hopkins University test solar array deployment of the Advanced Composition Explorer ACE in KSC’s Spacecraft Assembly and Encapsulation Facility_II SAEF_II. The wire hanging from the ceiling above the black solar array panel is used for g_negation, which takes the weight off of the panel’s hinges to simulate zero gravity, mimicking deployment in space. Scheduled for launch on a Delta II rocket from Cape Canaveral Air Station on Aug. 25, ACE will study low_energy particles of solar origin and high_energy galactic particles. The collecting power of instruments aboard ACE is 10 to 1,000 times greater than anything previously flown to collect similar data by NASA