> Why? If dark matter is 90+% of the mass of 'everything', then surely many more anomalies would occur without us having to be hit by a chunk of dark matter. It

> Why? If dark matter is 90+% of the mass of 'everything', then surely many more anomalies would occur without us having to be hit by a chunk of dark matter. It would simply have to be anywhere near us (or a nearby body we could observe carefully) to observe weird gravitational effects. Nearby ones, not 'out there in other galaxies' ones. two reasons. 1 - dark matter doesn't interact much with normal matter. so even though there's lots of it, most of the time it doesn't actually collide with anything. 2 - the "clumps" of dark matter are at much larger scales than our local system. variations are spread out at something like the size of galaxies; locally it is very smooth / uniform. if you're inside a uniform distribution of mass then you don't feel the gravitational effects (for example, at the centre of the earth you would weigh nothing). disclaimer: i was an astronomer, but have been doing real work for many years now.