Search for Dark Matter
All the stars in a spiral galaxy rotate around a center — but to astronomers, the speed that each star travels wasn’t making sense. Why didn’t stars slow down toward the edges as expected? Don Lincoln explains how a mysterious force called dark matter is (possibly) the answer — and why the search for an answer matters. Lincoln is a particle physics researcher at Fermi National Accelerator Laboratory and adjunct physics professor at the University of Notre Dame.
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