Why does Dark Matter Really Matter? (Closer to Truth)

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source: Closer To Truth    2016年9月29日
Dark matter, though it cannot be seen, may account for roughly one quarter of all the mass-energy of the universe. If it were not for the gravity of dark matter, galaxies could not hold together such that stars and planets would go flying off independently. But what is dark matter?
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Saul Perlmutter - Why does Dark Matter Really Matter? 9:05
George Smoot - Why does Dark Matter Really Matter? 7:40
Lee Smolin - Why does Dark Matter Really Matter? 10:17