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What is dark matter?

Dark matter is the term astronomers use for the matter that they detect in the universe which cannot be seen. What I mean by this is that although when you look through a telescope nothing appears to be there, the way that the visible matter moves indicates that there must be more mass present. It is currently thought that about 10% of the matter in the universe is visible, the rest is something we don't understand.

February 2001, Karen Masters (more by Karen Masters) (Like this Answer)

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