Constituents of the Universe

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Diverse lines of evidence lead us to believe that less than 5 percent of the universe is composed of the familiar particles of the Standard Model. Most of the universe is composed of dark energy, a mysterious phenomenon discussed in Unit 11. The remainder is dark matter, stuff less mysterious only because we have seen evidence of its existence for decades. The dark matter cannot be explained by the Standard Model, but appears to be the dominant form of matter in the universe. This unit will describe experimental evidence for dark matter and various attempts to understand what it could be. (Unit: 10)