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Honing the Hubble

New value supports finding that dark energy does not vary with time

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12:34pm, May 5, 2008

BALTIMORE — Astronomers are honing measurements of a familiar cosmic parameter to shed new light on dark energy, the mysterious entity that’s accelerating the universe’s rate of expansion.

Known as the Hubble constant, this parameter indicates the current rate at which distant astronomical objects are receding, a number that can be used to estimate the age of the universe.

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