#26 What's the matter? Really, what is the matter that makes up 80% of the mass of the universe but can't be observed directly. The strange story of dark matter

Cosmic Coffee Time with Andrew Prestage

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So back in the 1930's, astronomers noticed that there didn't seem to be enough mass in galactic clusters to hold them together, but they were held together. There mas be some additional mass and gravity to hold everything together, but where is it? It can't be seen. And this problem produced the theory of dark matter.
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