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Everything around us appears permanent. Mountains, oceans, planets, and even stars seem stable when viewed on human timescales. However, physicists have discovered that many objects once thought to be eternal eventually disappear. Stars exhaust their fuel, black holes may evaporate, and even atoms might not last forever. One of the most fascinating unanswered questions in physics is whether protons-the building blocks of ordinary matter-can decay.
Protons are found in the nucleus of every hydrogen atom and, together with neutrons, make up the nuclei of heavier elements. According to the current Standard Model of particle physics, protons are stable. No experiment has ever directly observed a proton decaying. However, several theories that attempt to unify the fundamental forces of nature predict that proton decay should occur, albeit over extraordinarily long timescales.
The predicted lifetime of a proton is difficult to comprehend. Some models suggest that a proton may survive for more than 10x34 years. For comparison, the universe itself is only about 13.8 billion years old. If proton decay occurs, it is so rare that an individual proton would almost certainly outlive every star currently shining in the cosmos.
To search for this phenomenon, scientists have constructed enormous underground detectors containing thousands of tons of ultra-pure water. These facilities are located deep beneath mountains to shield them from cosmic radiation. Researchers continuously monitor the detectors for the faint signatures that would indicate a proton has spontaneously transformed into lighter particles.
The discovery of proton decay would be revolutionary. It would provide evidence for new physics beyond the Standard Model and support theories that seek to unify the electromagnetic, weak nuclear, and strong nuclear forces. It would also have profound implications for the ultimate fate of matter in the universe.
If protons eventually decay, then ordinary matter itself is temporary. In the unimaginably distant future, planets, stars, and even the remnants of galaxies could slowly dissolve into elementary particles and radiation. This possibility transforms our understanding of permanence and reminds us that the universe operates on timescales far beyond human imagination.
Although proton decay has not yet been observed, the search continues. A single confirmed event could fundamentally change our understanding of the cosmos and reveal new laws governing the deepest structure of reality.