Are We the First Intelligent Life in the Universe? Maybe Not
Are We the First Intelligent Life in the Universe? Maybe Not
Are we the first intelligent life in the universe? It sounds like a yes-or-no question.
But one word in it is stranger than it looks: first. That is a word about time, not distance.
Imagine an intelligent species that appeared a billion years ago, lasted a few thousand years, and vanished long before there were humans to notice. If something like that happened, distance would not be what kept us apart. Time would.
I didn't start with aliens, though. I started with a quieter question: why do we exist, and how did we come to be? The more I turned it over, the further my mind drifted, until it ended up among the stars. By aliens, I mean intelligent life, someone like us, who lived a life and asked why they were there at all.
I do think someone like that has existed somewhere besides here, maybe long before us. I don't have evidence for that. What I have is a problem with the alternative: that in all that time, Earth was the only place where a mind ever looked at the universe and wondered what it was doing here.
But that thought led me right back to where I started. If they came into being and so did we, then why? And if we learn how it happened, will that tell us the reason?
What are you really seeing when you look up at the stars?
Picture stepping outside on a clear, dark night and scanning the sky for company. Every point of light above you is already old news. It left its source before you walked out the door, and some of it before you were born.
How old? Most of the brightest stars sit within a few hundred light-years of the solar system, according to NASA, so their light set out anywhere from a few years to a few centuries ago. Point a telescope at distant galaxies and the delay stretches to millions and billions of years. (If you'd like to try that yourself, my post on first telescope buying mistakes might save you some money.)
Here is the odd part: on its own, starlight is a time machine that cannot show us the one thing we most want to see.
A star's light carries news of the star itself, not of anyone who might have lived nearby. Finding such neighbors takes other kinds of observation, such as reading the chemistry of a planet's atmosphere, as NASA's life-search pages describe, or hunting for traces of technology.
So, are we the first intelligent life in the universe? Nobody knows. Life has been confirmed only on Earth, so no other civilization, living or long gone, has ever been detected. Still, one 2016 analysis suggests that unless a technological species is astonishingly unlikely to arise on a habitable planet, someone probably beat us to it. Everything hangs on that "unless."
Doesn't a universe this big mean we're not the first?
"The universe is so big, life must be out there somewhere." It is a common reply in online threads about aliens, and it feels airtight.
The numbers seem to agree. NASA's count of confirmed exoplanets reached 6,000 in September 2025, 750 times the eight planets in our own solar system. That sounds like a lot. It is. But it still doesn't answer the question.
Say you found six thousand locked rooms. Finding more of them tells you almost nothing about how often someone is inside.
That is the missing number: the chance that a planet produces life, and then the chance that life produces a technological species. There are estimates, models, and arguments, but no measured frequency. A huge universe does not hand us a huge answer. It hands us a huge number multiplied by one we still don't know.
Scientists have already taken the time problem seriously. In a 2016 paper, Adam Frank and W. T. Sullivan stopped asking how many civilizations exist right now and asked instead whether any other technological species has ever arisen. Think of the difference between counting the shops open today and counting every shop that ever opened. The ones that closed centuries ago still count.
That switch removes one unknown, how long a civilization survives, by rewording alone. The planet side of the math still rests on real data from Kepler and other exoplanet searches.
And timing is where the scale gets dizzying. The universe is more than 13 billion years old, and NASA's write-up of the study illustrates with a civilization that lasts about 10,000 years, roughly as long as ours has so far. By plain division, the universe's age is more than 1.3 million times that span. Two candles can burn in the same room and never be lit at the same moment.
Could intelligent aliens already be extinct, then? If civilizations last only that long, the write-up adds, any others that arose are likely already gone. The "ever" question does not mind. It counts the closed shops too.
Frank and Sullivan then turned the unmeasured chance into a threshold. Under their assumptions, NASA's summary says, human civilization is likely to be unique only if the odds of a habitable planet producing a technological species are less than about one in 10 billion trillion. The published paper puts the threshold lower still, near one in a trillion trillion.
Either number is easy to misread as the odds that we are alone. Neither is. Each is a line on a scale, not a measurement of where reality sits.
No one can say yet which side of that line we are on. I still think it beats any guess, because it turns a shrug into a bet with stated terms: anyone who insists we are the first is betting on odds that low.
One more thing about that study: it counts species that build technology. Intelligence alone would not register. A species that only wondered about its sky, without ever building anything, would slip through this math entirely.
Before we ask how often minds appear, though, there is a humbler test. Can we even tell whether a scoop of soil holds organic molecules, the carbon-based compounds that life builds with? We tried that on Mars, and the result is stranger than you would expect.
Have we found evidence of alien life, or did the test change the answer?
The Viking test sounds almost domestic: heat a sample of Martian soil and see what comes off. Scientists expected organic molecules, if only because meteorites deliver them.
What came off was a puzzle. The instruments reported only chloromethane and dichloromethane, compounds read at the time as possible contamination from cleaning fluids used on Earth. The organics scientists were waiting for never showed up.
Chris McKay of NASA Ames later summed it up: "The lack of organics was a big surprise from the Vikings."
So which was it: no organics, or organics the method could not see? If Earth contamination made those chlorine compounds, they say nothing about Mars. If Martian organics changed during heating, the same data point the other way.
Then, in 2008, the Phoenix lander found perchlorate in Martian soil, and the question changed. Perchlorate is a chlorine-and-oxygen compound that can react with organic material when heated.
Rafael Navarro-González of the National Autonomous University of Mexico and McKay put that to the test. They mixed perchlorate into organic-bearing desert soil from Chile and ran a Viking-style analysis. Out came the same kind of chlorine compounds Viking had reported. They published the result in 2010 in the Journal of Geophysical Research: Planets.
Suddenly those chlorine compounds no longer had to mean "no organics on Mars." They could also mean the test had changed the very thing it was looking for.
The instrument was supposed to be a window. It may have been a stove.
None of this means Viking found life. JPL says organics can come from biological or non-biological routes, and it stops short of throwing out the contamination idea. The lesson is smaller and more useful: "we found nothing" and "we found a sign" are both claims about the method as much as about Mars.
Fast-forward to July 2024, at a spot called Neretva Vallis in Jezero crater. NASA's Perseverance rover examined an arrowhead-shaped rock nicknamed Cheyava Falls, about 3 feet long and 2 feet wide (1 meter by 0.6 meters).
Its instruments mapped the rock's spots in detail: PIXL uses X-rays to chart which elements sit where, and SHERLOC uses light to identify organics and minerals. The team examined whether the organic matter there, and the chemistry involving iron, phosphorus, and sulfur, could have come about without life.
The twist was its age. By the standards of the rocks the rover has explored, it is a relatively young sedimentary rock, while the early assumption had been that traces of ancient life would cluster in the oldest ones. NASA's 2025 announcement, alongside a paper in Nature, called it a potential biosignature and said plainly that mineral pathways without life cannot be ruled out. So for now, the most anyone can honestly say is maybe.
Signals like this are what a seven-level scale, proposed by NASA researchers in 2021, is meant to grade. It starts with a hint, such as a biologically relevant molecule, then climbs as scientists rule out contamination from Earth and non-biological sources and find a second, independent detection.
Each step measures how far we can trust that a signal really is evidence of life. (For a lighter detour on what creatures elsewhere might look like, see my earlier post on why animals have heads, even aliens.) Whether that life could ever think is a different question altogether.
If life starts easily, is intelligence rare?
Now picture a laboratory at the University of Chicago in 1953, where Stanley Miller has built something like a tiny ocean and sky. Water boils. Methane, ammonia, hydrogen, and water vapor, the gases then thought to make up the early Earth's atmosphere, circle a loop and pass through an electric discharge. It runs for a full week without a break.
Next comes the sorting. Paper chromatography separates a mixture by how fast its parts travel, and spots appear. His paper in Science, published May 15, 1953, named glycine, alpha-alanine, and beta-alanine. It was careful about the rest: aspartic acid and one other amino acid left spots too faint to call with confidence, and Miller said as much.
What did that show? That the ingredients of life can come out of plain chemistry, with no living thing involved. You will sometimes hear that the experiment "created life." It made amino acids. A pile of bricks is not a house, and how chemistry became the first living system is still being worked out.
Even once life gets started, though, a second question waits behind it: does it keep going long enough to produce a mind?
David Kipping's 2020 PNAS analysis puts those two questions side by side, and adds a catch: the planet doing the asking. Earth got life early, which seems to say life starts without much trouble.
But if it takes a long time to evolve observers who can study their own planet's past, only planets that started early would ever produce someone to ask. It is like reading only the finalists' training logs and deciding that anyone who trains that way makes the final.
Even with that bias built in, and under the paper's models and assumptions, the early start still points to life beginning quickly. Intelligence was different. The lean toward it being rare was weak, just 3 to 2, and that is a comparison between scenarios, not the odds of anyone being out there.
Optimism about life does not carry over to minds. One planet, two answers, and they do not share a mood.
And then there is the long wait. Humans showed up late in Earth's story, and the classic "hard steps" reading treats that delay as a sign that intelligence is brutally difficult, a string of improbable hurdles that evolution somehow cleared. But a dinner can run late for two reasons: the recipe is tricky, or the groceries took their time.
A 2025 model by Mills and colleagues, described by Penn State, argues for the groceries. In their telling, photosynthetic microbes reshaped the atmosphere, and the new air opened the door for other kinds of life. That turns "How hard was the recipe?" into "When did the groceries arrive?"
It is a proposal, not proof that intelligence is inevitable, and the older model is still on the table. (Life and its surroundings rewriting each other is also a theme in my post on the asteroid and the dinosaurs.)
Either way, we are still missing the one thing that could settle it: another planet with its own history to compare.
Even if we knew exactly how, would that tell us why?
Online, "Do aliens really exist?" and "Why do we exist?" get posted as two separate questions. Follow either one far enough, and it runs into the other.
Notice what the evidence in this article actually answered. It put an age on starlight, framed the odds, and showed how an instrument can alter what it is trying to read. Every one of those is a how, when, or whether question. None of them measured a purpose.
The Stanford Encyclopedia of Philosophy separates the meaning of an individual life, the meaning of humanity as a whole, and whether the universe has a purpose, and notes that analytic philosophers today focus more on the first.
Here is the map I would keep, one question per row:
| Question | What the research reaches | Where it stops |
|---|---|---|
| Is there life beyond Earth? | Thousands of confirmed planets, and ways to read their atmospheres. | Life is confirmed only on Earth. |
| Did a technological species ever arise elsewhere? | Frank and Sullivan set a threshold for the odds; Kipping's models weigh life against intelligence. | No independent cases, so no observed frequency. |
| Is anyone out there right now? | The answer depends on how long civilizations last; NASA's example uses about 10,000 years. | That lifetime is an illustration, not a measurement. |
| Why do we exist? | Philosophy separates the meaning of one life, of humanity, and of the cosmos. | Beyond the reach of every study here. |
The two answers people usually land on both go too far. "Science explains how we arose, so there is no point" and "the universe needed us" each bolt a conclusion onto sources that never supplied one.
Which brings us back to the sky. Whether we turn out to be the first intelligent life in the universe or one of many latecomers, the starlight you saw at the start can tell you only when it left. On its own, it says nothing about whether anyone was there, and nothing at all about why anyone is here. Maybe that is why the question keeps getting asked twice, once of the sky and once of ourselves.
This piece ended up more complicated than I meant it to be. What began as a small question about why we're here turned into a tour of cosmic time, Martian soil, and minds that may never have overlapped with ours.
Maybe it all began with a minor complaint about life. When it felt as if some people had it a little easier while others carried heavier loads, I would wonder why I had to live like this. I asked why humanity exists, but what I really wanted to understand may have been my own life.
I still believe someone else was out there. After all, here we are. I just can't call it a fact.
And knowing how we came to be probably won't explain my life. How I was born and why I keep going are, to me, still two different questions.
I didn't find an answer. But writing this helped me see a little more clearly what I was asking. I wanted to know how humanity began, and why my days feel the way they do.
Sources & References
- Frank, A., and Sullivan, W. T., "A New Empirical Constraint on the Prevalence of Technological Species in the Universe," Astrobiology 16 (2016): journals.sagepub.com
- NASA, "Are We Alone in the Universe? Revisiting the Drake Equation" (2016): science.nasa.gov
- Kipping, D., PNAS (2020), analysis of life's early start and our late arrival: pnas.org
- NASA/JPL, "Missing Piece Inspires New Look at Mars Puzzle" (2010): jpl.nasa.gov
- Hurowitz, J. A., et al., "Redox-driven mineral and organic associations in Jezero Crater, Mars," Nature 645 (2025): nature.com
- NASA, Mars rover potential biosignature announcement (2025): nasa.gov
- NASA, Skywatching: science.nasa.gov
- NASA, "Can We Find Life?": science.nasa.gov
- NASA, tally of planets outside our solar system reaches 6,000 (2025): nasa.gov
- NASA Goddard, call for a new life-detection framework (2021): nasa.gov
- Penn State, "Does planetary evolution favor human life?" (2025): psu.edu
- Miller, S. L., "A Production of Amino Acids Under Possible Primitive Earth Conditions," Science 117 (May 15, 1953): 528–529: science.org (free archived copy: labs.bio.unc.edu)
- Stanford Encyclopedia of Philosophy, "The Meaning of Life": plato.stanford.edu
- Reddit question titles (used only as examples of public curiosity): Do aliens really exist?, Why do we exist?
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