Questions regarding the attractive force which exists between any two bodies of matter.

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Are there sufficient observational data to measure non-Newtonian perihelion advances of any Asteroid and Comet orbits?

Anomalous (i.e. not predicted from Newtonian theory) advances of the perihelion direction have been observed for many solar system planet orbits and have been accounted for by Einstein's General ...
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What is the direction of the dark energy force on gravitational rotation curve of galaxies?

Is the direction of this force is like gravity (to the center of mass) or orbiting objects' direction of movement?