Over twenty years had passed since it had become clear that there were innumerable galaxies lying deep in space, but there didn't seem much hope of learning any significant details about the inner structures of objects that were millions of light-years distant.
In 1943, however, the American astronomer Carl K. Seyfert (1911-1960) detected an odd galaxy with a very bright spot at the center. Other galaxies of the sort have since been observed, and the entire group is known as Seyfert galaxies. Altogether perhaps 1 percent of all galaxies are Seyfert galaxies.
This was the first case of what came to be called active galaxies, those with centers that seem to be the site of activity beyond the normal. Much more remained to be discovered about such galaxies when it became possible to observe them outside the range of visible light.
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|Publication:||Asimov's Chronology of Science & Discovery, Updated ed.|
|Article Type:||Reference Source|
|Date:||Jan 1, 1994|
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