Radio astronomers have recently begun to harvest a wealth of data using instruments with greatly improved sensitivity and resolution. They are now mapping the internal structure of galaxies and quasars over a wide range of the radio spectrum. Variations in the structure as well as in the intensity of these sources are being observed on time scales ranging from a few days to a few years. The velocities of the component parts of some of the sources have been measured, and they apparently exceed the velocity of light—only one of the many problems that the new data present to astrophysicists.
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© 1973 American Institute of Physics.
1973
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