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This is how science works, always open to change. If true this is a huge change.
https://www.earth.com/news/study-dark-matter-does-not-exist-and-the-universe-is-27-billion-years-old/
The universe has always held mysteries that spark our curiosity. As we currently understand it, the fabric of the universe comprises three primary components: ‘normal matter,’ ‘dark energy,’ and ‘dark matter.’ However, new research is turning this established model on its head.