View full lesson: http://ed.ted.com/lessons/dark-matter-how-does-it-explain-a-star-s-speed-don-lincoln
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.
Lesson by Don Lincoln, animation by RocknRoll Animation.
Tagged under: \Don Lincoln\,\RocknRoll,Animation\,\Gatze,Zonneveld\,\dark,matter\,physics,astrophysics,TEDEducation,TED-Ed,\TED,Ed\,universe,galaxy,\spiral,galaxy\,space
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