Atmosphere of Triton asymmetry was actually observed during star occultations by Triton in 1990s. Before Voyager 2 arrived, a nitrogen and methane atmosphere with a density as much as 30% that of Earth had been suggested. This proved to be a great overestimate, similar to the predictions of the atmospheric density of Mars, but like on Mars, a denser early atmosphere is postulated. Voyager 2 flew past Triton five hours after closest approach to Neptune in mid-late August 1989. During the flyby, Voyager 2 took measurements of the atmosphere, finding methane and nitrogen in the atmosphere. In the 1990s, observations from Earth were
NRIST S-80 series UAV NRIST S-80 series UAV NRIST S-80 series UAVs are Chinese UAVs developed by Nanjing Research Institute of Simulation Technology (南京模拟技术研究所) (NRIST), also known as the 60th Research Institute of People's Liberation Army General Staff Department (总参六十所), an ISO 9001 certified research/production facility headquartered in Nanjing. S-80 series UAVs are part of larger NRIST S-series UAVs. S-80 drone is a fixed wing UAV developed by NRIST, and it is a development of earlier NRIST B-9H drone. Like its predecessor B-9H, S-80 is also developed for naval use on board ships. S-80 drone is constructed of fiber glass reinforced plastic with aluminum