Modern physics is facing a profound conundrum. Gravity is a fundamental force of nature, nevertheless, there is no theory, among many proposed, that can explain satisfactorily the origin of gravity. In addition, there are two major theories in modern physics: general relativity and quantum physics. Each of these theories has been proven to be correct with high confidence. Yet, no theory which combines both has been found. Specifically, quantum physics does not relate to gravity, whereas gravity is a profound parameter in general relativity. A theory that tries to unify the theories is quantum gravity. Quantum gravity hypothesizes that gravity may arise from quantum phenomena. However, there is no accepted answer.I claim that gravity is the residual (or leftover) of the strong force that is confined inside nucleons. In other words, gravity originates from the strong force. In my answer I relate also to the profound open question: Why is gravity, which is involved in the structure of our entire universe, so much weaker than the other fundamental forces?