Originele uitgave 12 novembre 2012
Vorige aflevering S2012E78 - A needle in countless haystacks: Finding…
Aantal S2012E79
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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.