It starts innocently: “Were the earliest living things something like bacteria?” Then come bigger questions. Where did life's ingredients come from? Where did water and rock come from? What about stars, matter, and finally the universe itself?
We were looking for a microbe's birthday. Somehow we have reached the final boss: existence.
0. The answer: Much of the history is known; the ultimate reason is not
Observations strongly support a universe that was extremely hot and dense about 13.8 billion years ago and has expanded and cooled since. We can still measure ancient light from its infancy.[1][2]
But describing how the universe developed is not the same as explaining why anything exists. Neither creation from absolute nothing nor creation by a conscious designer has been scientifically demonstrated.[3]
1. A timeline from the early universe to you
- About 13.8 billion years ago: the universe was in an extremely hot early state.
- First few minutes: the cores of light atoms such as hydrogen and helium formed.
- Around 380,000 years later: cooling allowed atoms to form and ancient light to travel freely.
- Much later: stars formed, producing many heavier elements inside them or in violent endings.
- Around 4.6 billion years ago: the solar system started forming; Earth followed.
- At least 3.5 billion years ago: strong evidence shows that life already existed on Earth.[1][2][4][5]
The carbon in our bodies has a history connected to previous generations of stars. Rocks, water and living things share ingredients from the same cosmic story.[4]
2. How could nonliving material become alive?
Water plus rocks does not automatically produce bacteria. Scientists study how small molecules might gather, use energy, preserve information, and eventually make imperfect copies that can change across generations.[6][7]
Possible settings include shallow pools, hot springs and places where mineral-rich hot water rises from the seafloor. Experiments reveal pieces of this process, but no complete route to the first life has been established. Simpler systems may have existed before modern-looking bacteria.[6]
Mars and moons with hidden oceans are intriguing places to look. As of October 2026, extraterrestrial life had not been confirmed. Not yet found is not the same as proven absent.[8]
3. Where did matter come from?
Energy and particles could transform into one another in the extremely hot early universe. Some particles remained, eventually becoming atoms and stars.[1]
Yet there is a major mystery. Ordinary matter has counterparts with opposite properties; when the two meet, they can disappear and release energy. If the early universe made similar amounts of both, why is ordinary matter so much more common today? Research was still underway in 2026.[9][10]
Even solving that would leave a deeper question: why did the initial energy and the rules governing it exist at all?
4. What does “nothing” mean?
An empty room still contains a room, space and time. Even space without stars has properties and follows laws. The emptiest state studied by physics is not the philosophical absence of everything.[3]
Absolute nothing might mean no matter, light, space, time or laws. Whether such a state is even possible is disputed.[11]
That is why “a tiny fluctuation created the universe” is not a complete answer: why were the conditions that allowed that fluctuation there in the first place?
5. Was there a “before” the universe?
Time may be part of the universe, not a clock hanging outside it. If time began with our universe, “what happened before?” might be like “what is north of the North Pole?”. But it has not been proved that time really began there.[3]
Other proposals describe a stage before the hot universe we can reconstruct. Current evidence does not establish which, if any, is correct.
6. Possible explanations and their remaining problems
| Idea | What it tries to explain | What remains open |
|---|---|---|
| An origin from the rules of the very small | The early state | Why do those rules exist? |
| A previous universe shrank and expanded again | What came before the hot phase | Did it happen? What preceded it? |
| There are many universes | Why ours has these features | Can others be tested? |
| Reality has always existed | No first moment needed | Why is it eternal? |
| A creator made this universe | Who made our world | Why does the creator exist? |
| There is no deeper reason | Where explanation ends | Why stop there? |
These ideas do not all have equal scientific support. Some might yield testable predictions; others are mainly philosophical. Even the assumption that nothing would be the natural default needs justification.[3][11]
7. “Actually, I wrote this simulator.” Who made your world?
Imagine a developer appearing and saying, “I built your universe.”
Wonderful. Next question: “Who made the world you live in?” Then comes that developer's developer, and another. An infinite stack of servers does not automatically explain why the stack exists.
In 2003 philosopher Nick Bostrom offered a conditional argument involving three possibilities if advanced civilizations could create enormous numbers of simulated ancestors. It was not proof that we live in a simulation.[12]
Was the dinosaurs' extinction a scheduled server event? Is consciousness a feature or a bug? Great jokes and science-fiction ideas; not observational evidence.
8. How could science make progress?
Scientists measure faint patterns in ancient light, look at distant galaxies, compare particles in huge experiments, reproduce parts of early chemistry and look for signs of biology on other worlds.[1][2][6][9]
Future evidence might distinguish some accounts of the early universe. That would be real progress. Whether experiments can answer the ultimate question of why existence itself is possible remains unknown.
9. Five important distinctions
- Was there definitely nothing before 13.8 billion years ago? We do not know; even the meaning of “before” is unsettled.[3]
- Did the universe explode into an empty room? No. Space itself expanded.[1]
- Do ingredients for life prove aliens exist? No. Ingredients are not living organisms.[4][8]
- Would a creator end all questions? We could still ask why the creator exists.
- Would simulated lives be meaningless? That does not follow. Experienced joy and pain still matter.
We started with a microbe's birthday and wound up asking for the birthday of matter, time and existence. The answer is still missing. Yet the universe has produced creatures capable of asking where it came from.
Dear universe administrators: please publish the source code already.
References (12)
- NASA: The Universe's History science.nasa.gov
- ESA: Planck science highlights esa.int
- Stanford Encyclopedia of Philosophy: Philosophy of Cosmology plato.stanford.edu
- NASA: Where do life's building blocks come from? science.nasa.gov
- NASA: Astrobiology Strategy 2015 (earliest life evidence) assets.science.nasa.gov
- NASA: Where could life have gotten started on Earth? science.nasa.gov
- NASA: About Life Detection (2026-08-10) astrobiology.nasa.gov
- NASA: FAQ on extraterrestrial-life evidence science.nasa.gov
- CERN ATLAS: How 'odd' are Higgs boson interactions? (2026-03-27) atlas-public.web.cern.ch
- CERN: Antimatter home.cern
- Stanford Encyclopedia of Philosophy: Nothingness plato.stanford.edu
- Nick Bostrom (2003): Are You Living in a Computer Simulation? simulation-argument.com
