A huge survey of nearly 686,000 galaxies spanning about 7 billion light-years tested gravity at unprecedented scale. Using cosmic microwave background data and the kinematic Sunyaev Zel’dovich effect, researchers measured galaxy motions with high precision. Gravity behaved exactly as Newton predicted, strengthening dark matter evidence and challenging ideas that gravity changes in deep space, while also backing parts of Einstein’s relativity.
A new study suggests the universe may not expand forever. Researchers say dark energy could evolve over time, potentially reversing the force driving space outward. That scenario, known as the Big Crunch, would pull galaxies closer as expansion slows and reverses. Scientists stress this is only a theory and requires further evidence.
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