Icon Books Dark matter and dark energy: the hidden 95% of the universe, paperback/brian clegg

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Description All the matter and light we can see in the universe makes up a trivial 5 per cent of everything.

The rest is hidden.

Since the 1970s, astronomers have been aware that galaxies have far too little matter in them to account for the way they spin around: they should fly apart like clay off a potter's wheel, but something concealed holds them together.

This 'something' is dark matter - invisible material in five times the quantity of the familiar stuff of.