When it comes to a marriage with quantum theory, gravity is the lone holdout among the four fundamental forces in nature. The three others--the electromagnetic force, the weak force, which is responsible for radioactive decay, and the strong force, which binds neutrons and protons together within the atomic nucleus--have all merged with quantum theory to successfully describe the universe on the tiniest of scales, where the laws of quantum mechanics must play a leading role.
When it comes to a marriage with quantum theory, gravity is the lone holdout among the four fundamental forces in nature. The three others--the electromagnetic force, the weak force, which is responsible for radioactive decay, and the strong force, which binds neutrons and protons together within the atomic nucleus--have all merged with quantum theory to successfully describe the universe on the tiniest of scales, where the laws of quantum mechanics must play a leading role.
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