There is a study from July 28, 2026, that analyzes the light emitted by living beings—specifically, how this light extinguishes when we die. It is not just humans; plants and all living things emit light, though the types of emissions vary.
Some emissions are quite basic, such as the infrared light produced by body heat; any object with a temperature above absolute zero emits thermal radiation. Human bodies are far above absolute zero—hovering around 37°C—so we emit a significant amount of mid-infrared light. While invisible to the human eye, this light can be detected by thermal cameras and by certain animals, such as snakes. Crucially, this emission persists after death; because it is a purely physical phenomenon driven by heat, the body continues to emit light until that residual heat is lost.
Other emissions are more specific and unusual—such as the light generated when a sperm cell fertilizes or activates an egg upon entry. At that moment, there is an explosion or flash of light caused by zinc ions. This is a recent discovery, and the phenomenon is not limited to humans; it occurs in many other species that reproduce via fertilization.
This burst occurs in other species as well, though in different ways. In humans, the phenomenon is quite spectacular; researchers believe it indicates successful fertilization—since not all fertilization events succeed—with a brighter flash suggesting a better outcome, though I should note that this remains a subject of ongoing research. Electrical activity in our brains also generates photons—light photons—but these biophotons are different; they are byproducts of metabolism and vital activity. Unlike the biophotons observed in other studies, the ones produced by the brain are the subject of a highly speculative theory that should be approached with caution.
Some researchers believe that the photons emitted by neurons could serve as an optical communication system that complements the electrochemical signaling of our neurons. While it is not yet clear what purpose—if any—this serves, the emission does occur and varies depending on the brain activity taking place at the time; in other words, the photons emitted by our neurons differ depending on whether we are studying, in love, running, stressed, or asleep.
The research I am presenting now concerns biophotons—not those generated in the brain, but those produced by our entire body while it is alive, by all our cells as they function and remain vital. All living beings emit a faint glow—which can be detected here, for instance—that fades away upon death. However, this differs from how we typically understand death or see it portrayed in movies; when a movie character stops breathing and exhales their last breath, they are not yet truly dead—not even brain-dead. In principle, the brain can survive for a considerable time—a subject of ongoing research—meaning that if we had a system to resuscitate it, that character could return to "life."
Death does not occur the exact moment we stop breathing; just as this light persists as long as there are living cells, it gradually dims as those cells die off. According to researchers, this creates a genuine aura or glow—though one we cannot perceive with the naked eye because the photons are extremely weak. Nevertheless, it can be detected using specialized equipment.
Furthermore, this research examines how we can utilize that light—those ultra-weak biophotons—since, according to these new findings, it could be used to assess a person's health status; in fact, researchers believe it could serve as a non-invasive marker for monitoring metabolic activity. This would cover metabolism in a broad sense, as it could even reveal the presence of a broken bone, cancer, or other ailments. To reiterate, the emitted light changes depending on the body's condition; if you are in pain or suffering from an illness, the emission of photonic light differs.
Consequently, in the future, it might be possible to create something akin to the "tricorder"—the handheld device used by Starfleet doctors in *Star Trek*. These devices allowed for scanning the human body without physical contact, measuring vital signs and detecting diseases, injuries, or fractures; a doctor would simply pass the device over the patient to get a general idea of their condition. That is essentially what could be achieved in the future using biophoton technology. Moreover, it could prove more efficient or safer than the *Star Trek* tricorder; as I recall, that device emitted electromagnetic waves and fields that penetrated the skin—painlessly, of course—but required an emission to receive a signal and perform an analysis.
Using biophotons, it would be possible to create a device that—simply by passing over the body—could analyze photon emissions from the body as a whole or from specific areas to determine the patient's condition and the state of their organs, bones, muscles, and brain; it could analyze exactly what is happening to you without emitting anything itself, simply by reading or analyzing the photons you are already emitting.
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