We can’t see it, barely understand it, but know that it exists because of the powerful influence it exerts on space.

Dark matter makes up about 27% of the universe, and its gravitational force is enough to mesh entire galaxies together in a structure known as the cosmic web. Now, scientists have created the largest ever map of this mysterious substance – and it could imply that there’s something wrong with Einstein’s theory of relativity….

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theguardian.com/science/2021/may/27/astronomers-create-largest-map-universe-dark-matter-einstein