Dark matter is some kind of substance that has gravity—it holds galaxies together—yet cannot be directly seen with any ...
The first evidence for dark matter were galaxies that behaved as if they had far more matter than could be accounted for by the mass of their stars. Since then, we’ve found many other indications that ...
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In recent years, a curious hypothetical particle called the axion, invented to address challenging problems with the strong nuclear force, has emerged as a leading candidate to explain dark matter.
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