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What Is Quasar : A Reference Guide

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A quasar is an astronomical source of electromagnetic energy, including light, which shows a very high redshift.
The scientific consensus is that this high redshift is the result of Hubble's law. This implies that quasars are very distant.To be observable at that distance, the energy output of quasars must dwarf that of almost every known astrophysical phenomenon with the exception of comparatively short-lived supernovae and gamma-ray bursts. more...


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