We're getting very theoretical here, considering we're not even sure what dark matter is. Anyway, in the early universe, when all the matter was squished together a lot more tightly than it is today, stars that formed were often a little different. Oh sure, they were made of hydrogen, but they also contained a bit of dark matter in the form of Weakly Interacting Massive Particles.
These dark matter stars would have looked a lot different than the stars we know today. For one, they were gigantic, spanning up to 10 AU across. They could be millions of times heavier than the sun, and billions of times as bright.
The existence of these stars could solve a big mystery of the early universe. Galaxies seemed to form around supermassive black holes, but where did these black holes come from. A gigantic star would collapse into a gigantic black hole. It's almost a little too obvious.
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