Labels:bulletin board | reckoner | sky OCR: The test iS simple conceptually butit took decades for astronomers to develop detectors sensitive enough to study distant galaxies ir detail. When astronomers examine nearby galaxies that are powerful emitters 0i radio wavelengths they see at optical wavelengths, relatively round systems of stars Distant radio galaxies on the other hand appear t0 have elongated and sometimes irregular structures Moreover, in most distant radio galaxies, unlike the ones nearby, the distribution of light tends to be aligned with the pattern of the radio emission [see top illustration on next two pages]. Likewise when astronomers study the population of massive dense clusters galaxies, they find differences between those that are close and those far away Distant clusters contain bluish galaxies that show evid ...
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