This is the question behind The Matrix. In 2016, Elon Musk said there is only “a one in a billion chance” that we live in base reality. Many people took that as if it were a scientific finding. It is not. It is one person’s guess, and the actual research tells a much more careful story.
Here is the short answer, in plain words:
- No scientist has found any evidence that we live in a simulation. None. Not a single observation.
- The famous argument for it is a philosophy puzzle, not a discovery. It depends on big assumptions that nobody has proven.
- Recent physics papers have made the idea much harder to believe. They argue that our universe has properties that no computer in a universe like ours could ever copy.
- But the idea cannot be fully killed either, because we cannot test it directly. It stays in the zone of “interesting, unproven, and probably not true.”
Here is the full picture, step by step.
Where the idea came from
In 2003, an Oxford philosopher named Nick Bostrom published a formal argument. It is called a trilemma, which is just a fancy word for a three-way fork. The argument says that one of these three things must be true [1, 4]:
- Almost no civilizations survive long enough to become powerful enough to run realistic computer simulations of their ancestors
- Civilizations that become that powerful almost never choose to run such simulations, maybe because of laws, cost, or simple lack of interest
- If they do run many simulations, then most “people” like us would be simulated copies, not originals, so we are almost certainly living in a simulation
The logic goes like this: if making a simulated person is cheap, and future societies make billions of them, then simulated people would vastly outnumber real ones. If you are a random person, the odds say you are more likely to be a copy than an original.
Two things get lost in internet retellings. First, Bostrom himself does not say we are simulated. He says we have no evidence to rule out any of the three branches, so we should divide our belief roughly equally among all three. Second, the whole argument rests on two giant assumptions (an assumption is something you accept as true without proof). It assumes that a mind can run on a computer at all, which scientists call substrate independence (substrate means the material something is built from; the claim is that consciousness is like software that can run on any hardware, brain or computer), and nobody has proven that. It also assumes future societies will actually want to run ancestor simulations. If either assumption fails, the math collapses [1, 4].
The pushback from philosophers and scientists
The argument has attracted serious criticism from big names in physics and philosophy:
- Brian Weatherson attacked the probability trick at the heart of the argument, showing that the method Bostrom uses to assign odds does not do the work required
- Sean Carroll, a well-known physicist, pointed out a problem inside the argument itself: it assumes we can predict that future civilizations will run simulations, while at the same time insisting we cannot predict whether our own civilization will survive, which is the very first branch of the fork
- Frank Wilczek, a Nobel Prize winner in physics, raised a common-sense objection: the laws of physics are full of hidden complexity that serves no purpose in any simulation, and the laws are the same everywhere at all times. He also asked the awkward question everyone dodges: if this world is simulated, then what is the simulator itself made of? What are its laws?
- Paul Davies argues the idea defeats itself: the argument needs a near-infinite multiverse to produce the simulators, and if that leads to an absurd conclusion, maybe it is the multiverse theories that are wrong, not reality
- Sabine Hossenfelder, a physicist and author, has called the whole hypothesis pseudoscience and religion; George Ellis, another respected physicist, called it technically impracticable and noted that “late-night pub discussion is not a viable theory” [1]
One clever counterpoint came from philosopher Barry Dainton: even if computers can never run minds, the argument partly survives, because a future society could grow real human brains and wire them to false inputs. So the idea is harder to kill than its critics hoped. But note what that version requires: actual human brains, not computers. The Matrix version, at least, needs the software claim to be true [1].
The “one in billions” claim does not hold up
Here is the uncomfortable fact behind the viral statistics. David Kipping, an astronomer at Columbia University, ran the simulation argument through a proper statistical method called a Bayesian analysis (a Bayesian analysis is a way of updating your beliefs when new evidence arrives, step by step, instead of guessing). His result: based on what we know today, the odds that we live in base reality versus a simulation are about 50-50. The “one in billions” claim is not what the math supports [5].
Kipping’s analysis also produced a striking twist. If humanity ever builds its first truly conscious simulation, the odds flip overnight, from slightly-better-than-even that we are real to almost certain that we are simulated. “It’d be a very strange celebration of our genius that day,” he noted. And a recent poll found only about 22% of the public finds the idea at least somewhat likely. Even Neil deGrasse Tyson, who once offered “better than 50-50” odds, publicly reversed himself after physicist J. Richard Gott showed him a structural problem: in the argument’s own logic, every simulated universe must also be able to make simulations, and our universe currently cannot, which makes “we are real” or “we are the last link in a very short chain” the more likely reading. “That changes my life,” Tyson said [1].
The physics problem: the universe may be too big to copy
This is where the hardest pushback has come from. Physics cannot test whether simulators exist, but it can test whether our universe behaves like something a computer could run. The 2025 results were blunt.
Computation. Our universe runs on quantum mechanics, and quantum reality is brutally expensive to simulate. Many natural processes require resources that grow exponentially, meaning the computer needed grows impossibly fast with every added particle. Analyses summarized by physicists note that copying the information content of the visible universe, roughly 10^123 bits (a bit is the smallest unit of information, a yes or no), would demand about 2^10^123 operations, a number so large it exceeds what the holographic principle allows (the holographic principle is a proven limit in physics on how much information can fit inside any volume of space). In plain words: the computer would have to be bigger than the universe it is pretending to create [5].
Energy. A 2025 paper in Frontiers in Physics attacked the resource question directly. In physics, information and energy are linked; processing information always costs energy. The researchers tested three versions of a simulation: the entire visible universe, Earth alone, and even a deliberately low-resolution Earth. In all cases, the energy or power required was either “entirely incompatible with physics” or “literally astronomically large.” Their conclusion: it is simply impossible for our universe to be simulated by another universe sharing the same properties, no matter how advanced the technology [2].
Logic. A team at the University of British Columbia led by Mir Faizal went further, publishing what they claim is a mathematical proof that simulation is impossible. Their argument uses Gödel’s incompleteness theorems (Gödel was a mathematician who proved, shockingly, that any mathematical system complex enough to describe arithmetic will always contain true statements it cannot prove). The team argues that a complete theory of quantum gravity (quantum gravity is the still-missing theory that would unite Einstein’s gravity with quantum mechanics) will necessarily contain truths that cannot be derived by following rules, what they call “non-algorithmic understanding” (algorithmic means step-by-step, like a recipe; non-algorithmic means understanding that cannot be reduced to a recipe). A computer simulation must follow rules, so it can never copy a universe whose deepest level is rule-free. “Any simulation is inherently algorithmic… but since the fundamental level of reality is based on non-algorithmic understanding, the universe cannot be, and could never be, a simulation” [3, 5].
The caveats matter as much as the claim. The logical proof rests on the unproven assumption that quantum gravity will turn out to be a formal system of rules, which other physicists are not required to accept. And critics note the 2025 papers, at their strongest, prove something narrower: that our universe could not be simulated by another universe with physics like ours. A simulator running in a universe with different, richer physics would face none of these limits. If the simulators ever have to fake a quantum-gravity result we have not discovered yet, we would have no way to know the answer was fake [2, 3, 5].
Why many physicists refuse to call it science at all
Strip away the equations and the hypothesis faces a simpler problem: it makes no prediction. If the universe looks regular, the simulators are skilled. If it looks glitchy, the simulators slipped. If an anomaly appears, that is evidence; if no anomaly appears, the simulators are hiding their tracks. A theory that explains every possible observation explains nothing, and by Karl Popper’s standard of falsifiability (falsifiability is the test of a real scientific theory: it must be able, in principle, to be proven wrong by some observation), it fails the test of what counts as science. Physicist Sean Carroll’s summary circulates widely: “If a theory doesn’t change your expectations for what you’ll observe, it’s not really a scientific theory.” Attempts to build actual tests, such as a 2012 proposal to search for grid-like signatures in the highest-energy cosmic rays, have so far found nothing, and no observation has ever pointed to computer artifacts in nature [1, 5].
Philosophers also note the idea never escaped its ancestors. Plato’s cave, Descartes’ evil demon, Zhuangzi’s butterfly dream, the brain in a vat: every era projects its most advanced technology onto the mystery of reality. Ours happens to project computers. That pattern does not disprove the idea, but it explains its popularity better than its evidence does [1].
What would change the picture
The hypothesis is not beyond evidence in principle. Realistic candidates for decisive evidence include lattice-like discreteness in space and time confirmed by cosmic ray observations, primordial gravitational waves matching a simulation signature, or the day, if it ever comes, that humanity builds a genuinely conscious simulation, which under Kipping’s analysis flips the odds. A negative result of a different kind would also count: if physics someday produces a complete, final theory that is fully rule-based and computable, the logical impossibility argument loses its foundation [1, 3, 5].
Myths vs facts
| Claim | Verified answer |
|---|---|
| “Scientists have discovered we live in a simulation.” | False. There is no evidence, no observation, and no experiment supporting it. The idea is a philosophy puzzle plus physics-based objections [1, 2]. |
| “Elon Musk proved the odds are one in billions against base reality.” | False. That figure is a sound bite, not a calculation. The most rigorous statistical analysis to date puts the odds near 50-50 [1, 5]. |
| “Physicists have now proven we don’t live in a simulation.” | Too strong. The 2025 papers show simulation is impossible by a universe like ours, and face contested assumptions about quantum gravity. They raise the cost of belief; they do not settle the question [2, 3]. |
| “The simulation hypothesis is a scientific theory.” | Contested. It makes no falsifiable prediction, and leading physicists exclude it from science on precisely those grounds [1, 5]. |
| “Quantum mechanics looks like a rendering engine, so that’s evidence.” | Myth. No observation has ever indicated computer artifacts or “rendering.” Proposed tests have found nothing [1]. |
| “If it’s possible, then it’s probable.” | The core contested step. This depends on substrate independence (unproven), on how you count observers (disputed since Weatherson), and on assigning probabilities to events with zero data [1, 5]. |
| “Bostrom says we’re probably simulated.” | Misquoted. He divides his belief roughly evenly among all three branches and explicitly declines to pick one [1, 4]. |
Bottom line
Are we living in a simulation? The evidence says nobody knows, and the physics of the last two years has made “probably” a much harder word to justify. The argument that launched the debate survives only as a conditional: if consciousness can be copied onto computers, and if future societies run ancestor simulations by the billion, and if nothing interrupts the chain, then the numbers would favor simulation. Three big ifs. On the other side sit measurable facts: our universe’s physics hides complexity no programmer would need, obeys limits no simulator sharing our physics could meet, demands energy on impossible scales, and may rest on mathematics that no rule-following machine can capture. Against all that stands a philosophy of probability that assumes the very thing it needs to prove. The honest scoreboard: no evidence for it, growing structural evidence against it, and a question that has resisted every attempt to make it a scientific one. If the simulators are out there, they are winning at hide and seek. If they are not, the universe just built a story about them the way it once built stories about gods: out of the tools, and the fears, of the age [1, 2, 3].
Disclaimer: This article reflects the state of a contested research and philosophy topic as of late 2026. Claims of proof, in either direction, remain disputed among experts. If you notice an error or would like to send feedback or corrections, please contact us.
References
- [1] Simulation hypothesis, Wikipedia
- [2] Astrophysical constraints on the simulation hypothesis for this universe: why it is (nearly) impossible that we live in a simulation, Frontiers in Physics, 2025
- [3] Scientists proved we’re definitely not in a simulation, Popular Mechanics, 2025
- [4] The Simulation Argument (Nick Bostrom’s project site)
- [5] Beyond the Matrix: 4 scientific arguments against the simulation hypothesis (Kipping analysis, computational limits, and the Faizal logical argument), Medium
