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How will the universe end? A changing understanding of dark energy may provide a new answer

NEW YORK — Scientists are homing in on the nature of a mysterious force called dark energy, and nothing short of the fate of the universe hangs in the balance. The big question is whether this dark energy is a constant force, which scientists have long thought, or whether the force is weakening, a surprising wrinkle tentatively proposed last year. Their updated results, taken with other measurements — exploding stars, leftover light from the young universe and distortions in galaxy shape — support the idea presented last year that dark energy may be waning. It’s not time to completely rule out the idea that dark energy is constant because the new results are still shy of the gold standard level of statistical proof physics requires.

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