[Illustration: The rings of Jupiter proved to be unexpectedly bright when seen with the Sun nearly behind them. Strong forward scattering of sunlight is characteristic of small particles. These two views were obtained by Voyager 2 on July 10 from a perspective inside the shadow of Jupiter. The distance of the spacecraft from the rings was about 1.5 million kilometers. Although the resolution has been degraded by camera motion during the time exposures, these images reveal that the rings have some radial structure. [260-610B/W and 260-674]] [Illustration: Rings of Jupiter.] HIGHLIGHTS OF THE VOYAGER 2 SCIENTIFIC FINDINGS[3] Atmosphere The main atmospheric jet streams were present during both Voyager encounters, with some changes in velocity. The Great Red Spot, the white ovals, and the smaller white spots at 41°S, appear to be meteorologically similar. The formation of a structure east of the Great Red Spot created a barrier to the flow of small spots which earlier were circulating about the Great Red Spot. The ethane to acetylene abundance ratio in the upper atmosphere appears to be larger in the polar regions than at lower latitudes and appears to be 1.7 times higher on Voyager 2 than on Voyager 1. An ultraviolet map of Jupiter shows the distribution of absorbing haze. The polar regions are surprisingly dark, suggesting that the absorbing material must be at high altitudes. Equatorial ultraviolet emissions indicate planet-wide precipitation of charged particles into the atmosphere from the magnetosphere. The high-latitude ultraviolet auroral activity is due to charged particles that originate in the Io torus. Satellites and Ring System The ring consists of a bright, narrow segment surrounded by a broader, dimmer segment, with a total width of about 5800 kilometers. The interior of the ring is filled with much fainter material that may extend down to the top of the atmosphere. Images of Amalthea in silhouette against Jupiter indicate that the satellite may be faceted or diamond shaped. Volcanic activity on Io changed somewhat, with six of the plumes observed by Voyager 1 still erupting. The largest Voyager 1 plume (Pele) had ceased, while the dimensions of another plume (Loki) had increased by 50 percent. Several large-scale changes in Io’s appearance had occurred, consistent with surface deposition rates calculated for the large eruptions. Europa is remarkably smooth with very few craters. The surface consists primarily of uniformly bright terrain crossed by linear markings and very low ridges. There are four basic terrain types on Ganymede, including younger, smooth terrain and a rugged impact basin first observed by Voyager 2. Callisto’s entire surface is densely cratered and is likely to be several billion years old.