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Dark matter: How does it explain a star’s speed? – Don Lincoln

Don Lincoln | TED-Ed

View full lesson: http://ed.ted.com/lessons/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.

Lesson by Don Lincoln.

Animation by RocknRoll Animation.