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Why Is Gravitational Force Always Attractive ?

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Why is gravitational force always attractive, as opposed to electrostatic forces, which is are both attractive and repulsive ?  :sherlock:

It just is, according to observation. And of course, in general relativity (which is currently our best model) it is not really a force at all, but a manifestation of the curvature of spacetime by mass. 

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The real "problem" about understanding gravitation is the same as when Newton was asked, "What is it?"

All we really have are descriptions and suppositions about how it behaves.

I suppose so, but in the end that is all we have about any of the fundamental features of physics.


Ultimately science produces models to describe how nature behaves, but does not answer the deepest questions about the nature of reality.

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