The First Stars Spell Trouble for Dark Matter

The First Stars Spell Trouble for Dark Matter
AP Photo/ESA, Planck Collaboration via NASA

In the beginning, reheating created a hot plasma of elementary particles. The plasma expanded, cooled, and emitted the cosmic background radiation. Then gravity made the plasma clump, and darkness was upon the face of the deep, whatever that means.

Cosmologists call it the “dark ages,” the period in the early universe where matter is already too cool to emit radiation, but not yet clumpy enough to ignite nuclear fusion

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