In many theories of gravity, the cause of gravity is neither mentioned nor clarified yet. Dark energy, which makes the universe accelerate and push all matters in the universe apart, has repulsive power. Every matter in space is equally pressured by this repulsive force from all directions. It is assumed that this force comes from infinity in space. However, if matters exist nearby, the matters shield each other from the repulsive force; and thus, the repulsive force acting on the matter is not isotropic anymore. When two nearby bodies are applied with this shielding effect, they are pushed toward each other; and the theoretically derived net pushing force on each body is mathematically equivalent to the Newton’s attractive gravitational force. This result shows that the gravity may come from dark energy.
Key words: Dark energy, gravity, cosmic repulsive force, shielding effect, expanding universe.
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