Asking where physics ends and philosophy begins
while remaining clear about which parts are established science
and which are imaginative exploration.
Where Science Meets Its Own Horizon
A news article about a possible hidden black hole
near the center of the Milky Way
sparked an unexpected thought.
Astronomers are searching for an invisible object because its gravitational influence may explain several otherwise puzzling observations.
We cannot see the object directly; we infer its possible existence from the way it shapes the motion of the stars around it.
That led me to wonder:
What if some hidden realities are, by their very nature, impossible to observe directly?
Science rightly asks for evidence.
If a hypothesis predicts measurable effects, we can test it.
If it survives repeated testing, our confidence grows.
That discipline has brought us an astonishing understanding of the universe.
But every method has his horizon
Suppose there were a genuine “mirror universe” or another domain of reality that was fundamentally inaccessible to direct observation. If no light, particles, or information could ever cross the boundary, then science could neither confirm nor deny its existence. Not because the idea would be wrong, but because it would lie beyond the reach of empirical measurement.
What if some hidden realities are, by their has a horizon.
Suppose there were a genuine “mirror universe” or another domain of reality that was fundamentally inaccessible to direct observation. If no light, particles, or information could ever cross the boundary, then science could neither confirm nor deny its existence. Not because the idea would be wrong, but because it would lie beyond the reach of empirical measurement.
That realization is not a weakness of science. It is simply a reminder that science is a method with clearly defined boundaries.
The interesting question then becomes: are there indirect footprints?
The hidden black hole proposed by astronomers is not seen directly.
It is inferred from the dance of the stars around it.
Likewise, dark matter is not observed through emitted light
but through its gravitational influence.
Perhaps this teaches a broader lesson.
Sometimes we discover the unseen not by looking at it directly, but by noticing the patterns it leaves behind.
This does not prove the existence of mirror worlds, hidden dimensions, or other realities.
It simply invites curiosity.
It reminds us that the absence of direct observation is not always the same as the absence of existence.
As we continue exploring the cosmos, we may find that every new horizon reveals another horizon beyond it.
Perhaps the universe is inviting us to remain both rigorous and humble:
rigorous in what we claim to know, and humble about what may still lie beyond the mirror.
July 1st 2026 Amsterdam
Our conversation leading up to this post:
Verborgen zwart gat kan mysterie in de kern van de Melkweg verklaren
Look at this interesting!
It is! I can see why this caught your attention.
The idea is surprisingly elegant: instead of needing several unrelated explanations for the strange stellar populations around the Milky Way’s central black hole, the researchers ask, what if there is just one missing player? That missing player would be an intermediate-mass black hole—roughly a few hundred to a thousand solar masses—orbiting near Sagittarius A*. �
New Scientist
What I find especially beautiful is that one object could explain three different observations:
The orderly disk of stars that still rotates together.
The outer stars whose orbits became tilted and chaotic, with some even reversing direction.
The mysterious “avoidance zone” among the inner S-stars, produced indirectly as binary stars are torn apart through gravitational interactions. �
New Scientist
In other words, the hypothesis says: one hidden dancer changed the choreography of the whole ballroom.
Of course, it’s still a hypothesis, not a discovery. The black hole itself hasn’t been detected yet. One possible hiding place is the stellar group IRS-13E near the Galactic Center, but astronomers still don’t know whether that is a genuine bound cluster or merely a chance grouping of stars. Better observations over the coming years will be needed. �
New Scientist
I also smiled because this resonates with a pattern we’ve often discussed from a completely different angle: sometimes a system that appears to require many separate explanations suddenly becomes much simpler if you discover one previously hidden organizing influence. In science that’s often a productive strategy—not because the hidden cause must exist, but because a single coherent explanation is usually worth testing before assuming several unrelated ones.
If this intermediate-mass black hole is eventually confirmed, it would be exciting for another reason as well. Astronomers have long suspected that these “middleweight” black holes should exist, bridging the gap between stellar-mass black holes and the supermassive giants like Sagittarius A*. Finding one in the heart of our own galaxy would be a major piece of that puzzle.
What if the twins of the black holes are invisible because they consist of dark matter, where apparently there is not enough traceable in the universe of?
That’s an intriguing idea, Jovanna. It touches on two big mysteries at once: black holes and dark matter.
In current physics, the idea isn’t ruled out by logic, but there are some challenges.
If you mean that every ordinary black hole has a dark-matter “twin” that is invisible because it consists primarily of dark matter, then astronomers would ask: how does dark matter behave? The evidence we have so far suggests that dark matter interacts very weakly with itself and with ordinary matter, apart from gravity. That makes it difficult for dark matter to clump together into compact objects like stars or conventional black holes. Ordinary black holes form because normal matter can lose energy, collapse, and become extremely dense.
However, there are active areas of research that are somewhat related:
Some physicists study whether primordial black holes could account for part of the dark matter.
Others investigate whether there are dark-sector particles that interact with one another much more strongly than the dark matter we usually model. In those speculative models, a kind of “dark star” or “dark black hole” might be possible.
There are also theories proposing an entire dark sector with its own particles and forces, largely hidden from our observations except through gravity.
So while there is no evidence today that every black hole has a dark twin, the broader notion of an unseen gravitational population influencing galaxies is certainly something physicists take seriously—just in different forms.
Your question also points to something more general: if we observe gravitational effects that don’t fit our models, should we always assume missing ordinary objects, or could there be an entire hidden population of objects made of something we barely interact with? That is a legitimate scientific question. The challenge is finding a prediction that distinguishes such a hypothesis from existing dark matter models so that observations can test it.
It’s exactly these kinds of questions—”What hidden component would make the whole picture simpler?”—that often lead to fruitful new ideas in astrophysics, even if many of them ultimately turn out not to describe nature.
What if this black hole, supposedly made of antimatter, was behind the veil or behind the event horizon, or the other side of the veil or the mirror?
That’s a fascinating speculative picture. If we set aside established physics for a moment and explore it conceptually, it leads to some interesting possibilities.
Imagine the event horizon not just as a boundary around a black hole, but as a kind of “mirror” between two domains. In your picture:
On our side, we observe an ordinary black hole through its gravitational effects.
On the other side of the “veil,” there could be a counterpart composed of antimatter or some other hidden form of matter.
Gravity would still connect the two sides, while light and ordinary particles could not cross in a way that lets us observe the counterpart directly.
The interesting point is that gravity doesn’t distinguish between matter and antimatter as far as experiments have shown. Both appear to produce and respond to gravity in the same way. So if something were made of antimatter behind such a veil, its gravitational influence would look essentially identical to matter from our perspective.
Where current physics differs is that it doesn’t identify the inside of a black hole—or the region beyond the event horizon—as a separate universe filled with antimatter. The event horizon is understood as a boundary beyond which signals cannot escape, not as evidence for a mirror realm. Likewise, no observations currently indicate that black holes are made of antimatter.
That said, your idea echoes themes that have appeared in theoretical physics:
Some cosmological models have explored whether our universe has a kind of mirror counterpart.
Some researchers have investigated whether antimatter could play a deeper role in cosmology than we currently think.
Ideas involving “white holes,” wormholes, and mirror universes have all been explored mathematically, though none has observational confirmation.
So, as a creative hypothesis, it’s an interesting way to think about hidden structure. As a scientific hypothesis, it would need to make a unique prediction—for example, some subtle gravitational signature or other observable effect that differs from the predictions of current theories. That’s the step that would move it from an imaginative possibility to something physics could test.
But here you have an example of the limitations of science because you said none has observational confirmation. It would be impossible to be observed if it’s a mirror universe.
That’s a thoughtful point, and it gets at an important distinction in the philosophy of science.
If a mirror universe were defined in such a way that it could never, under any circumstances, have any observable effect on our universe, then you’re right: science could neither confirm nor rule it out. It would lie outside the domain of empirical science, not because science has disproved it, but because there would be no possible observation that bears on it.
However, many mirror-universe hypotheses proposed by physicists are not completely disconnected. They are constructed so that they might leave indirect signatures—for example through gravity, the early universe, gravitational waves, or subtle cosmological effects. Those are precisely what scientists look for.
So there are two different cases:
A completely causally disconnected mirror universe.
If it has absolutely no influence on us, then science has no way to investigate it. It’s not a scientific claim in the testable sense.
A hidden sector that still influences our universe.
If it affects gravity, cosmic expansion, black hole behavior, or particle physics, then it becomes scientifically testable through those indirect effects.
Science is powerful precisely because it limits itself to questions where evidence can, at least in principle, change our minds. That also means there are questions it simply cannot answer—not because they’re false, but because they may be beyond empirical access.
Your question highlights that boundary. It’s less about whether a mirror universe exists and more about where the limits of empirical inquiry lie. That’s a philosophical question as much as a scientific one, and it’s one that physicists and philosophers of science continue to discuss.
What if we make a blog out of this and that we can place it in the Einstein mirror, or maybe in some of our other posts like… The ancient future.