Hi, some researchers have wondered whether the G in F(M,m,r)=GMm/rr was a true constant. I believe an associated problem is the motion of stars on the edge of our galaxy (there are either too fast or too slow...). A nonconstant G was then proposed to explaine this motion. This may relate to dark matter too, I 'm not sure. If someone can brief me of the current state this problem, I'd appreciate it.(adsbygoogle = window.adsbygoogle || []).push({});

My related question is more mathematical : What is (are) the proposed alternative(s), for F(M, m, r)? Can we make somekind of an expansion to F so that other terms G2, G3, ...Gn, are introduced? Experimentally (according to fits), what does F look like for these far away stars?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Is G really a constant?

**Physics Forums | Science Articles, Homework Help, Discussion**