This is an article from the new Scientist magazine. It discusses the possible theories and assumptions from the observed behavior of Quasars. BTW, Quasars are distant galaxies that are bright enough that they can be seen from earth. Based on the Hubble's law of expanding universe and Einstein's theory of relativity, distant galaxies should show time delays. Distant supernova does but quasars are not. What could be the correct explanation?
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