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Dark matter is an invisible type of matter theorised to make up the majority of all matter in the Universe. It has mass, but it can't be seen and doesn't interact with ordinary matter.
According to our standard model of cosmology, dark matter makes up 85 per cent of all the matter in the Universe, and 27 per cent of the Universe's total mass-energy.
Despite its name it can’t simply be made up of dead stars, gas and dust. Dark matter has to consist of something more exotic than standard atomic particles to ensure the Big Bang produces a universe chemically similar to the one we see.
Such observational constraints have forced theorists to focus on a handful of candidates for dark matter.
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