Our current knowledge covers only about 15% of the matter in the Universe. The remaining 85% is dark matter, of which we know virtually nothing.
Dark matter is a hypothetical type of matter different from ordinary matter, such as protons, neutrons and electrons. To study it one can use a scintillator, a material, which emits a faint light when a particle passes through it. Scintillators haves to be ultra-pure to reduce at minimum the ‘’noise’’ of their intrinsic background in order to be able to detect the rare interactions with the dark matter.
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