B Does Local Gravity Override Dark Matter in Galactic Rotation?

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The discussion centers on whether local gravitational effects among stars at the edges of galaxies can influence their rotation speeds, potentially challenging the existence of dark matter. Participants explore analogies, such as the Earth-Moon system, to illustrate how gravitational interactions might alter orbital dynamics. It is argued that while local gravitational influences exist, they do not significantly affect the overall orbital velocities of stars in a galaxy, as these velocities are determined by the total mass distribution. The conversation also touches on the complexities of modeling such systems and the stability of gravitational configurations. Ultimately, the consensus suggests that while local gravity plays a role, it does not negate the need for dark matter in explaining galactic rotation curves.
  • #31
weirdoguy said:
Is anyone saying that string theory is empirically verified? No. So what's your point? Besides, this thread is about plain old classical gravity. Physicists may be wrong when it comes to untested models like string "theories", but gravity - Newtionian and Einsteinian - has been tested and observationally verified on so many levels that putting it's validity in doubt is very unreasonable, to say the least.
OK. More to the point what empirical evidence is there for "dark matter"?
 
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  • #32
This has nothing to do with this thread, so start your own with this question. Or search for other threads about this issue, because it has been discussed here multiple times.
 
  • #33
weirdoguy said:
This has nothing to do with this thread, so start your own with this question. Or search for threads for other threads about this issue, because it has been discussed here multiple times.
 
  • #34
Ibix said:
...the general problem with advancing science isn't coming up with new ideas. It's coming up with new ideas that aren't obviously wrong to anyone who knows anything about the topic.
:oldbiggrin:
 
  • #35
Viopia said:
OK. More to the point what empirical evidence is there for "dark matter"?
It's a pity you're banned, and that this is off-topic. Else I would have you look up the Bullet Cluster.
 
  • #36
The thread topic has been sufficiently discussed. Thread closed.
 

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