What is the composition of the universe?
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Astronomers are faced with an embarrassing dilemma: they have no idea what 95% of the cosmos is made of. Atoms, which make up everything we see around us, make up only 5% of the total. Over the last 80 years, it’s become evident that the vast majority of the universe is made up of two mysterious entities: dark matter and dark energy. The former, discovered in 1933, works as an invisible glue that connects galaxies and galaxy clusters.