4 ms·
Hm i wonder why someone thought there is some invisible, unobservable dark matter instead connecting gravitational waves with super massive black holes in cente
by lossolo 10y ago
Hm i wonder why someone thought there is some invisible, unobservable dark matter instead connecting gravitational waves with super massive black holes in center of every galactic. It seems for me like a lot better answer to question what is keeping galaxies together if observable mass is not enough.
- goodcanadian 10y agoI found it a bit hard to understand before I actually took the course in university, but I'll try to explain simply: You can infer the mass that is interior to an orbit by measuring the speed at which an object is orbiting. By measuring the redshift and blueshift, we can get speeds of different parts of the galaxy. It turns out that we can account for more-or-less all of the mass near the centre of galaxies, but as we get further out, orbital velocities seem to be higher than they should be implying more mass is there than we can actually see. In other words, we can tell that the missing mass is not at the centre of the galaxy, but rather spread throughout it.
- lossolo 10y agoI see, it makes sense now, thank you for very clear explanation.