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All of that, although – the atoms, molecules, and fuel that make all of it up – accounts for less than 5 per cent of the universe. One other 25 per cent is in one thing known as darkish matter, which makes up many of the mass of galaxies. We expect it’s a weakly interacting huge particle. It doesn’t emit its personal mild, however we are able to measure it by way of its interactions with regular matter through gravity.
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