Elon Musk thinks we could be living in a simulated universe. Douglas Adams once wrote about something uncannily similar. In The Hitchhiker’s Guide to the Galaxy: the mighty computer “Deep Thought” is built to answer the ultimate question of Life, the Universe, and Everything.
After 7.5 million years, it returns with 42, then points out that the answer is useless because nobody properly knew the question.
Simulation theory has exactly the same flavour. Large brains, larger claims, and a faint stench of panic.
So here, in the spirit of “Deep Thought” and instability, are five reasons we might be living in a simulated universe.
Why We Might Be in A Simulation
1. Nick Bostrom’s argument still stands
In 2003, philosopher Nick Bostrom argued that at least one of three things must be true: civilisations like ours usually go extinct before becoming advanced enough to run ancestor simulations; advanced civilisations survive but do not bother running such simulations; or we are almost certainly already inside one.
2. The statistics of conscious simulation
If even a small fraction of advanced societies create large numbers of simulated worlds populated by conscious beings, then simulated minds could quickly outnumber original biological ones. If there are far more simulated minds than real ones, then the odds quietly flip: you are more likely to be simulated than real.
3. Technology keeps making the idea less laughable
This is the bit Musk loves. At the 2016 Code Conference, he said there was only a “one in billion” chance we are in base reality, pointing to the rapid evolution of games and simulations.
What was once crude and pixelated is now immersive and increasingly indistinguishable from reality.
4. A simulated world might still count as real
Even if we are simulated, it does not follow that our experiences are meaningless. The simulation argument is not about whether our lives are “fake” in a trivial sense, but about what reality is made of and how it is generated.
From the inside, a simulated world could still contain genuine thoughts, relationships and consequences.
5. Nobody has decisively ruled it out
The simulation hypothesis survives partly because there is no accepted knockdown refutation from inside the system.
If we are in a simulation, it may be hard for beings inside it to prove otherwise. Philosophically, that leaves the door annoyingly ajar. This is an inference from the structure of Bostrom’s argument and the absence of any agreed empirical disproof in the literature cited here.
Now, before anyone starts addressing the kettle as “rendered appliance object 7B,” here are five reasons we might not be living in a simulated universe:
Why We Probably Are Not
1. The energy bill may be completely monstrous
Astrophysicist Franco Vazza argued in a 2025 paper that simulating a universe like ours would require energy or power demands that are, in several scenarios, incompatible with known physics.
He examined simulating the visible universe, Earth, and even a low-resolution Earth, and concluded that the requirements were astronomically large.
2. The probability argument may be much shakier than fans suggest
Astronomer David Kipping revisited Bostrom’s logic in 2020 using Bayesian analysis.
Once uncertainty about whether such simulations are technically possible is included, the probability that we are simulated is less than 50 percent, tending towards an even split.
3. There is no accepted scientific test
At present there is no neat experiment that can distinguish base reality from a sufficiently sophisticated simulation.
Without a workable empirical test, the idea remains more philosophically stimulating than scientifically settled. That is supported by the fact that the central sources here are philosophical and probabilistic rather than experimental demonstrations.
4. Strange physics is not the same thing as computer code
People love to point at quantum strangeness and say, “Pixels.”
But strange features of reality do not automatically mean simulated reality. They may simply be features of ordinary physical reality, however odd and uncooperative it turns out to be. This is an inference, but it follows from the fact that none of the cited simulation papers treat quantum oddness as proof of simulation.
5. Deep Thought itself contains the warning
Adams’s joke was not that giant computers are silly. It was that human beings are forever demanding ultimate answers while remaining gloriously fuzzy about what they are asking. That feels painfully relevant here. Deep Thought’s answer of 42 is meaningless precisely because the question was not properly defined.
So Where Does That Leave Us?
In a very Douglas Adams position. Musk says base reality is wildly unlikely. Bostrom insists the logic is serious. Kipping says not so fast. Vazza says the power requirements are obscene.
Which means the rest of us are left with a possibility that is at once fascinating and frustrating: we may be living in a simulated universe, or we may not, and we may not be able to tell the difference.
Either way, the bins still need to go out. The emails still need answering. And the universe, simulated or otherwise, remains astonishingly poor at customer service.
