Gerard Francis Gilmore FRS FRAS FInstP is Professor of Experimental Philosophy, in the Institute of Astronomy, at the University of Cambridge... (wikipedia)
We never find smaller amounts of dark matter or more concentrated dark matter.
We are almost exactly twice as massive as Andromeda.
These are the first properties other than existence that we've been able determine.
It?s important to note this stuff is not hydrogen atoms, it?s just how much it weighs.
That?s about a million times faster than predictions.
This temperature tells us something very fundamental about the properties of dark matter.