Dark matter: How does it explain a star’s speed? - Don Lincoln
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TEDEd
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Classroom Material
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Dark matter: How does it explain a star’s speed? - Don Lincoln

TED-Ed Lesson: 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 …
Publisher
TED Ed

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