The big bang was the origin of everything in the universe. Or so we thought. Most – 95% no less – of the universe is dark matter and dark energy. It has long been assumed that the big bang was the origin of this dark matter and energy in the universe, as well as the matter and energy we can see. But this assumption is wrong. Dark matter and energy have an origin story of their own, writes Katherine Freese and Martin Winkler. The Dark UniverseThe Universe contains a strange and surprising combination of ingredients. All the objects of our daily experience – our bodies, the chairs we sit in, the air we breathe, the Earth, the Sun, all the stars and planets, all made of atoms – all of that adds up to only 5% of the content of our Universe. The other 95% is the dark side: the dark matter makes up 25% of the total, and dark energy the remaining 70%. Galaxies, including our own Milky Way, are made up almost entirely of dark matter. When we …
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