Mysterious 'Dark Energy' Winning Cosmic Tug of War

Summary

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WASHINGTON - Ten years ago, an unexpected astronomical discovery stunned the scientific world: Two rival teams of astrophysicists separately claimed that most of the universe is made of an invisible substance they called "dark energy." Only a tiny fraction, they said, consists of the ordinary atoms that make up stars, chairs and people.

Dark energy has shaken the fields of physics and astronomy, much as Copernicus did five centuries ago when he declared that the Earth revolved around the sun, not the other way around.

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Mysterious 'Dark Energy' Winning Cosmic Tug of War

Ten years later, the astronomers who made that astonishing claim say their findings have been confirmed repeatedly and made more precise. But they confess that no one...

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