Archive: Dark Matter, the mysterious substance in space

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Dark Matter is a proposed form of matter that does not absorb, reflect or emit light. It is known to make up 27% of our universe, while the matter that makes up stars and galaxies accounts for only 5%. In this archive episode, first released in March 2015, Melvyn Bragg and his guests discuss dark matter, the mysterious and invisible substance existing throughout the Universe. In 1932 the Dutch astronomer Jan Oort noticed that the speed at which galaxies moved was at odds with the amount of…