HARALD RITSCH / SCIENCE PHOTO LIBRARY HARALD RITSCH / SCIENCE PHOTO LIBRARY
Loop quantum gravity (LQG), illustration. This theory combines quantum physics and the force of gravity according to Einstein's general relativity. Combining these forces into a unified theory is one of the big challenges in physics. This theory describes space time as a quantum mechanical spin network in dimensions of Planck units. The result is known as spin foam.
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