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...physical processes that lie behind these different manifestations of active galaxies...Introduction to active galaxies: 3.2 Seyfert galaxies - In 1943 the American astronomer Carl Seyfert (1911-1960) drew attention to a handful of spiral galaxies that had unusually bright point-like nuclei. Figure 12 shows NGC 4051, one of the first Seyfert galaxies to be identified....

...physical and mental bits of our work. […] Equipment for the roaming worker will have access to the network via satellite or terrestrial systems. People will control computers and services simply by talking in everyday language. Computers will understand all major languages and understand what the user means most of the time, asking clarification questions to resolve any...