News for hackers. Stuff that matters.

A comment on New class of galaxy has been discovered, made almost entirely of dark matter. Parent comment

Re:New class of galaxy has been discovered, made almost enti... by grkvlt on Friday August 26, 2016 @06:11PM (#12369661)
> speed past the center

What caused these particles to accelerate up to the speeds they are at in the first place, then? Something must be interacting with them quite significantly if they have non-zero velocity?

[ Parent | on HN ]
Re:New class of galaxy has been discovered, made almost enti... by gus_massa on Friday August 26, 2016 @06:37PM (#12369790)
Gravity.

Actually, almost the only thing that we know about dark mater is that gravity affect it.

(Actually, we only know that there is something that is making a gravitational pull of normal mater, and we call this mysterious thing "dark mater".)

[ Parent | on HN ]
Re:New class of galaxy has been discovered, made almost enti... by openasocket on Friday August 26, 2016 @06:28PM (#12369743)
the force of gravity
[ Parent | on HN ]