==>> Many astronomical objects emit radio waves, but that fact wasn't discovered until 1932. Since then astronomers have developed sophisticated systems that allow them to make pictures from the radio waves emitted by astronomical objects. A number of celestial objects emit more strongly at radio wavelengths than at those of light so radio astronomy has produced many surprises in the last half-century.
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==>> Many astronomical objects emit radio waves, but that fact wasn't discovered until 1932. Since then astronomers have developed sophisticated systems that allow them to make pictures from the radio waves emitted by astronomical objects. A number of celestial objects emit more strongly at radio wavelengths than at those of light so radio astronomy has produced many surprises in the last half-century.
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the branch of astronomy concerned with radio emissions from celestial objects.