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“One of the biggest goals in physics today is to unify the strong, weak, electromagnetic, and gravitational forces into one unified force, or what physicists call the “Grand Unified Theory”. It has already been discovered that at high enough energies, electromagnetism and the weak force are the same force, known as the electroweak force. It is theorized that if energies are increased even further, all the known forces will boil down into the same force. If the standard model can be simplified in this way, it may lead into areas of further study in order to get a better grasp of the world around us.” hep.yorku.ca/yhep/gut.html [hep.yorku.ca]

James Maxwell took a big step toward this goal when he unified electricity and magnetism, and physicists now understand that at high energies the electromagnetic and weak forces are aspects of the same force.” particleadventure.org/unified.html [particleadventure.org]

Grand Unification, grand unified theory, or GUT refers to any of several very similar unified field theories or models in physics that predicts that at extremely high energies (above 1014 GeV), the electromagnetic, weak nuclear, and strong nuclear forces are fused into a single unified field.

Thus far, physicists have been able to merge electromagnetism and the weak nuclear force into the electroweak force, and work is being done to merge electroweak and quantum chromodynamics into a QCD-electroweak interaction sometimes called the electrostrong force. Beyond grand unification, there is also speculation that it may be possible to merge gravity with the other three gauge symmetries into a theory of everything. en.wikipedia.org/wiki/Grand_unification_theory [wikipedia.org]