What Is Gravity Made Of?
Nature is governed by only four fundamental forces. We understand what three of them are made of and how they function, but the story of gravity—the force most familiar to us—remains a mystery. What is gravity made of? Does it have particles of its own? If so, how can they be identified? The enigma of nature and the mysteries of the universe have fascinated humankind since ancient times. Yet, it is only in the last few centuries that we have begun to unravel its workings with considerable accuracy. Modern science now knows a great deal—though not everything—about the universe, its origins, and the secrets of nature. By piecing together knowledge accumulated over centuries, we now understand that nature, or the universe, operates under the governance of just four fundamental forces. These forces, along with specific particles, bind the vast cosmic family together. These four natural forces hold everything in the universe in place. The four fundamental forces consist of the electromagnet...