To get attention, one must sometimes call the smartest the dumbest, Cliff.
Now that this idea has attention, I can go back to the original position of saying that a force is always invisible and that specific results can therefore be explained in two different ways (until the final truth is known).
Either a collapsed mass exists beyond a scientific horizon, or the collective of masses in a galaxy cause the gravitational phenomenon.
What makes physicists 'dumb' is that they picked one model to agree on and are silence about all other options.
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In a binary star system, we have three gravitational centers. One with each mass, and one with the barycenter between both stars. No one envisions a collapsed mass in the middle.
With a ten-star system, we have eleven gravitational centers. No one envisions a collapsed mass in the middle.
So, why did physicists change models when they went from ten stars in a system to 100,000,000 stars in a system. All of a sudden, there is a collapsed mass in the center.
Explain that to me, Cliff. Why would physicists change models halfway?