Age of the Universe for the Most Distant Quasars

age vs. discovery date

This figure displays our ever-increasing knowledge of the early universe. The vertical axis is the age of the universe when the light left the most distant known quasar; the horizonal axis is the date. In the past 35 years the era of the universe that we have been able to probe with quasars has dropped in age by more than a factor of three, and now stands at less than 800 million years.
Image credit: Don Schneider, SDSS Collaboration

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