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" ... But we don’t quite get everything. Dark matter is the one extra “thing” we can add — and it turns out to be an ingredient rather than a modification — to solve the greatest number of these problems all at once, but it doesn’t quite give us everything. It doesn’t solve the (bigger) problem of the expansion rate, and it doesn’t explain the (smaller) puzzle of why, despite outmassing normal matter by a 5-to-1 ratio, the Universe is spatially flat. Somehow, a full 2/3 of the Universe’s total energy isn’t accounted for. ... "
" ... The observational evidence for dark matter indicates that there are slow-moving massive particles throughout the Universe, outmassing normal matter by a 5:1 ratio. The evidence shows up in how galaxies cluster together, in the fluctuations in the Big Bang's leftover radiation, how individual galaxies move and rotate, how the large-scale structure of the Universe forms and in how galaxy clusters collide. ... "