Quasar
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Quasar

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High Quality Content by WIKIPEDIA articles! A quasi-stellar radio source is a very energetic and distant galaxy with an active galactic nucleus. Quasars were first identified as being high redshift sources of electromagnetic energy, including radio waves and visible light, that were point-like, similar to stars, rather than extended sources similar to galaxies. While there was initially some controversy over the nature of these objects as recently as the early 1980s, there was no clear consensus as to their nature there is now a scientific consensus that a quasar is a compact region 10-10,000 ...