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Talk3 min

Dark matter: How does it explain a star's speed?

Don Lincoln · TED

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About

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. [Directed by Gatze Zonneveld, narrated by Don Lincoln].

The talk

  1. Dark matter: How does it explain a star's speed? 3 min · TED's player

Credits and licence

Institution
TED
Department
TED-Ed
Speaker
Don Lincoln
Year
2012
Level
For everyone
Language
English
Subjects
Astronomy and space, Teaching and learning
Source
TED
Licence
CC BY-NC-ND 4.0, as TED states it. Non-commercial use only, and no changed versions. TED's terms
Attribution
TED Talks are licensed by TED under Creative Commons BY-NC-ND 4.0 International and are shown here in TED's own player, as TED's usage policy asks.
Who can watch
TED gives no rating. Invisible Network shows it to Tweens profiles and older, judged from what the source says about it. How courses are placed