Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____.

Name: Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____.
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Quasars have large redshifted spectra, indicating they are moving away from us at high speeds, which is consistent with the expansion of the universe. This redshift also implies they are very distant, and thus we see them as they were in the early universe, not as they are now.

Astronomers Conclude That Quasars Must Come from the Earliest Phases