TheSkySearchers

“In the search for a cosmological model that perfectly explains our universe, most astronomers invoke the notion of dark matter. But what if they should instead modify the age-old laws of gravity? In the first of a three-part series, Keith Cooper explores the struggles and successes of modified gravity in explaining phenomena at varying galactic scales, as well as matching observations from the cosmic microwave background”

Part 1 of 3 - part 2 and 3 to follow。

https://physicsworld.com/a/cosmic-comba ... d-gravity/

It's an interesting read Arry but does it not fall down with this assumption:

Rather than following the inverse-square rule, at accelerations below a0 gravity drops off more slowly, by the inverse of distance. So something orbiting at four times the distance would feel a quarter of the gravity, not a 16th.

Graeme