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