Strange dark energy acts as galactic diet enforcer

WASHINGTON (AP) -- Mysterious dark energy, which likely causes the universe to keep expanding, seems to have another effect: It prevents the biggest clusters of galaxies from getting too fat. Astronomers used X-rays to study the formation of galactic clusters billions of years ago. Their research supports the hard-to-fathom concept of dark energy as a potent force that governs the growth of the universe....

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