Speed of early universe’s expansion determined

Rate known as Hubble constant now known with great precision for ancient universe

By Andrew Grant, 09:52 AM April 9, 2014

SAVANNAH, Ga. — Ask an astronomer how fast the universe is currently expanding and you’ll get a fuzzy answer (SN: 4/5/14, p. 18). But thanks to a measurement with unprecedented precision, astronomers can now confidently cite the speed of cosmic expansion that was occurring nearly 11 billion years ago.

Physicists with the Baryon Oscillation Spectroscopic Survey reported April 7 at a meeting of the American Physical Society that they had improved on their 2012 measurement (SN: 12/29/12, p. 9). T...

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