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> Also, a centralized huge mass would create a different velocity profile from what we are seeing. Doesn't need to be centralized, no? They can orbit the galax
by euyyn 9y ago
> Also, a centralized huge mass would create a different velocity profile from what we are seeing.
Doesn't need to be centralized, no? They can orbit the galaxy as the other bodies.
- _ph_ 9y agoWell, right. You could have a distribution of black holes. But that would mean a lot of black holes - all of them in space so void of other matter that they have no accretion disks. Also, with black holes so common, we would see many collisions with plain stars - and those would be very visible.