The Photon That Shouldn’t Have Reached Earth: What This Discovery Could Reveal About the Universe
In October 2022, astronomers recorded one of the most extreme cosmic events ever observed: GRB 221009A, a gamma-ray burst so intense that it became known as the BOAT — Brightest Of All Time.
According to NASA, the event was so extraordinary that similar explosions may occur, on average, only once every several thousand years. The light from this phenomenon traveled approximately 1.9 billion years before reaching Earth.
But years after the explosion, one detail continues to intrigue physicists.
Among the particles associated with the event was a photon with an estimated energy of about 300 teraelectronvolts — 300 TeV.
And that photon presents a problem.
According to conventional models of physics, it should have had an extremely low chance of making the entire journey to us.
First: What Is a Photon?
A photon can be understood as an elementary unit of light and other forms of electromagnetic radiation.
The visible light we see is also made of photons.
But photons can have vastly different energies.
A photon of visible light carries an energy on the order of just a few electronvolts. The photon associated with GRB 221009A, by contrast, reached the extraordinary scale of approximately 300 trillion electronvolts.
For comparison, NASA notes that visible-light photons typically fall in the range of roughly 2 to 3 electronvolts.
So we are not simply talking about “very bright light.”
We are talking about a particle of radiation carrying an extraordinarily large amount of energy.
Where Did It Come From?
GRB 221009A was detected on October 9, 2022.
Gamma-ray bursts are among the most violent known events in the Universe. In the case of long-duration GRBs, one of the main explanations involves the collapse of a very massive star, forming a black hole and producing jets of matter and radiation traveling at speeds close to the speed of light.
GRB 221009A was exceptionally intense.
NASA estimates that it was approximately 70 times brighter than any other GRB previously recorded by the instruments used in that comparison.
The explosion was so powerful that it saturated several space-based detectors.
And it was in this extreme event that the photon now raising new questions appeared.
So Why “Shouldn’t” It Exist?
The phrase makes for a dramatic headline, but scientifically it needs to be refined.
The photon can exist.
The real problem is this:
according to conventional propagation physics, it should not easily have reached us with that energy.
The Universe is not completely transparent to extremely high-energy photons.
As these photons travel across billions of light-years, they interact with radiation fields that fill space.
One of them is the cosmic microwave background, the thermal remnant of the early Universe.
At certain energies, interactions between very energetic photons and these background photons can produce particle pairs, causing the original radiation to be absorbed.
For that reason, a photon with an energy of around 300 TeV coming from such a great distance should have had an extraordinarily small probability of arriving at Earth intact.
That is exactly the tension researchers are now trying to understand.
What If Our Theories Are Incomplete?
In September 2026, physicists Giorgio Galanti and Marco Roncadelli published an analysis in Physical Review Letters devoted to this problem.
They examined possible explanations for the photon’s arrival.
One hypothesis often discussed in high-energy physics involves so-called axion-like particles, or ALPs.
In some theoretical scenarios, photons could temporarily convert into these particles during their journey through space and later convert back into photons.
Because ALPs would interact far less with the radiation filling the Universe, this could potentially allow part of the energy to travel across enormous distances without being absorbed.
However, the new study concluded that the ALP scenarios they considered, on their own, do not appear to satisfactorily explain the 300 TeV photon.
That led the researchers to examine an even more fundamental possibility.
Could One of Einstein’s Rules Need Adjustment at Extreme Energies?
One of the foundations of relativity is something called Lorentz invariance.
Put very simply, it states that the fundamental laws of physics should remain the same for observers moving uniformly relative to one another.
This symmetry is one of the pillars of modern physics.
Some theories that attempt to reconcile gravity with quantum physics, however, allow for the possibility that at extremely high energies, tiny violations of this symmetry could emerge.
The authors showed that certain models involving Lorentz invariance violation could make the propagation of this photon compatible with its arrival at Earth.
That does not mean relativity has been disproven.
It certainly does not mean “Einstein was wrong.”
It means that extreme phenomena like this may allow scientists to test physical regimes that are extraordinarily difficult to reproduce in laboratories on Earth.
But Are We Sure the Photon Really Came From the GRB?
This is an essential point.
The photon was detected by the Carpet-3 experiment, coming from the direction of GRB 221009A.
The association is highly interesting, but it is still being investigated.
The scientific paper itself discusses the observation under the hypothesis that the photon is indeed connected to the GRB.
In science, extraordinary events require exceptionally careful confirmation.
So the correct statement at this stage is not that new physics has been discovered.
The correct statement is:
there is an observation that is difficult to reconcile with our current expectations, and researchers are trying to understand why.
Why Are Events Like This So Important?
Because science often advances precisely at these points.
For long periods of time, a theory explains what we observe extremely well.
Then something appears that does not fit perfectly.
A measurement.
A particle.
An orbit.
An anomaly.
Sometimes the problem turns out to be in the experiment itself.
Sometimes an explanation is found within the existing theory.
And, very rarely, that small mismatch opens the door to an entirely new understanding of nature.
The photon associated with GRB 221009A does not yet tell us which of these possibilities is correct.
But it gives us something perhaps equally valuable:
a question that our current theories have not yet answered definitively.
The Universe Still Leaves Room for the Unknown
There is a profound difference between saying:
“Science does not yet know.”
and saying:
“Any explanation is possible.”
The first statement is an essential part of science.
The second is not.
The fact that we do not yet fully understand the journey of this photon does not confirm ideas about subtle energy, consciousness, therapeutic frequencies, or any specific technology.
But it reminds us of something important.
Our knowledge of the Universe is extraordinary — and still incomplete.
There are phenomena we can predict with astonishing precision.
And there are others that appear at the limits of our theories and force us to ask:
what are we still not seeing?
Perhaps that is one of the most fascinating things about science.
Every answer expands our knowledge.
But some answers also reveal much bigger questions.
Sources
The main study is “Lorentz-Violating Scenarios for the Highest-Energy Photons from GRB 221009A,” by Giorgio Galanti and Marco Roncadelli, published in Physical Review Letters in September 2026.
For background on GRB 221009A and the BOAT event, NASA provides additional context on its intensity, distance, and observational characteristics.
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