View Full Version : Quasars Tell The Story Of How Fast The Young Universe Expanded

2014-Apr-07, 05:20 PM
For those who saw the Cosmos episode on William Herschel describing telescopes as time machines, here is a clear example of that. By examining 140,000 objects called quasars*(galaxies with an active black hole at their centers), astronomers have charted the expansion rate of the universe — not now, but 10.8 billion years ago. This is […]

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