Glimpse at early universe finds expansion slowdown

BOSS project looks at acceleration rate before dark energy hit the gas

By Andrew Grant, 17:13 PM November 20, 2012

New measurements have captured the universe’s expansion when it was slowing down 11 billion years ago, before a mysterious entity called dark energy took over and began spurring the cosmos to expand faster and faster. The measurements, reported online November 12 at, are an important step toward understanding what dark energy is and how it works.

About 15 years ago, astronomers discovered that the universe’s expansion is accelerating by cataloging spectacular stellar explosions ca...

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