Word: outermost
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Controllers at NASA's Ames Research Center, near San Francisco, say that the probe could be destroyed as it swoops close to the outermost of Saturn's thin visible rings. But safe passage should provide a scientific bonus. After passing Saturn, Pioneer 11 will turn its electronic eyes on Titan, largest of Saturn's ten known moons, which seems to have a solid surface and methane atmosphere. The satellite could shelter organic molecules and-it is an extreme long shot-even primitive life forms. Since scientists have found no life on Venus, Mars or Jupiter, sighs Project...
...latest flood of information from these Jovian satellites would have thoroughly awed the great Italian Scientist Galileo, who discovered them 369 years ago. Moving at speeds approaching 45,000 m.p.h., the 1,800-lb. spacecraft swept by Callisto, the oldest, outermost and apparently smoothest of the Galilean moons...
...surface of Callisto, the outermost of these moons, is riddled with craters, apparently the result of pummeling by meteorites for some 4 billion years. Although it is mountainless, Callisto has a feature never before seen in the solar system: a huge, smooth, circular basin rimmed with concentric ridges that look almost like a frozen tsunami (tidal wave). Appearances may not be entirely deceiving: the scientists speculated that these ridges were created when a particularly large meteorite hit, melted subsurface ice and caused the water to spread out from the place of impact, only to freeze rapidly again...
...photographs of Callisto, darkest and outermost of the Galilean moons, showed that this gloomy sphere may be at least half water. Ganymede also seems watery, but appears to have an ice crust and possibly a mud core. Remarkably, both moons are dotted with dark spots that some scientists are tentatively calling ice volcanoes-craters that spew ice instead of fire and lava. Still closer to Jupiter, Europa apparently hides a rocky core beneath its bright icy surface...
...planet, was not discovered until 1930, and little is yet known about it. Now astronomers have learned surprising new things about the faroff planet: it appears to have a moon, seems to be much smaller than previously estimated and may some day be stripped of its title as the outermost member of the sun's family of planets...