Quasars: Mileposts marking the universe's expansion

Tuesday, September 18, 2012 - 14:00 in Astronomy & Space

Researchers have found a possible way to map the spread and structure of the universe, guided by the light of quasars. The technique, combined with the expected discovery of millions more far-away quasars over the next decade, could yield an unprecedented look back to a time shortly after the Big Bang, when the universe was a fraction the size it is today.

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