How can "Nothing" Exist Before the Big Bang?…The Mystery Beyond the Big Bang

Ajouté : 2026-05-24

[00:00:02][music] >> For as long as humans have looked up at the night sky, we have returned to the same impossible question.

[00:00:10]How did all of this begin?

[00:00:12]Every star, every galaxy, every atom in your body, all of it traces its origin back nearly 14 billion years to a single incomprehensible moment. We call it the Big Bang.

[00:00:27]And what we know about it is extraordinary.

[00:00:30]What we don't know is more extraordinary still.

[00:00:33]The birth of everything.

[00:00:35]And the problem with before the Big Bang is routinely misunderstood.

[00:00:41]It was not an explosion in the way we typically picture one, not matter hurtling outward into pre-existing empty space.

[00:00:48]It was something far stranger.

[00:00:50]Space itself began expanding everywhere at once, carrying matter and energy with it.

[00:00:56]Even more unsettling, time, as we understand it, may have begun at that very moment.

[00:01:03]This is not poetry.

[00:01:04]It follows directly from Einstein's general theory of relativity, which describes space and time not as separate backdrops to the universe, but as a single interwoven fabric, space-time. When cosmologists mathematically rewind the universe's expansion, that fabric shrinks toward a boundary where all physical laws collapse.

[00:01:28]Physicists call this boundary a singularity, a state of infinite density and temperature, where our equations cease to function. Which raises an uncomfortable truth. If time itself emerges from the Big Bang, then asking what came before it may be a category error.

[00:01:48]Like asking what lies north of the North Pole. The question sounds meaningful.

[00:01:53]It may simply not be.

[00:01:56]And yet, science rarely stops at the first answer.

[00:02:00]The oldest light in the universe, we cannot see the Big Bang directly, but the universe left behind a fossil.

[00:02:09]The cosmic microwave background, CMB, faint radiation that fills all of space, released roughly 380,000 [snorts] years after the Big Bang, >> [music] >> when the cosmos finally cooled enough for atoms to form. Before that moment, the universe was an opaque, glowing fog, so hot and dense that light could not [music] travel freely. When the fog cleared, light escaped for the first time. That ancient light is still reaching us today, stretched billions of years of expansion into microwave frequencies invisible to the human eye. It is, quite literally, the oldest photograph we will ever have, and it is astonishing in its detail.

[00:02:57]Tiny temperature variations within this radiation, regions warmer or cooler by fractions of a degree, mark the seeds from which everything we can see eventually grew.

[00:03:09]Galaxies, galaxy clusters, vast vast cosmic web of filaments and voids.

[00:03:15]All of it can be traced back to these minute irregularities frozen into the CMB. The universe we cannot see studying this ancient light has revealed something [music] deeply strange.

[00:03:27]Everything we can directly observe, every star, planet, gas cloud, and galaxy accounts for only about 5% of what exists.

[00:03:38]The remaining 95% is invisible to us.

[00:03:42]Approximately 27% appears to be dark matter, an invisible substance that neither emits nor reflects light, yet exerts gravitational pull on everything around it.

[00:03:55]Without it, the galaxies we observe would not have had enough gravitational scaffolding to form at the rate they did. The math simply doesn't work without dark matter holding it together.

[00:04:07]The remaining 68% is even more enigmatic.

[00:04:11]Dark energy, a force that appears to be driving the expansion of space to accelerate.

[00:04:18]This was discovered in the late 1990s when two independent teams studying distant supernovae found that the universe [music] isn't just expanding.

[00:04:29]It's expanding faster and faster.

[00:04:32]Something is pushing everything apart.

[00:04:35]Nobody knows what it truly is. Recent observations have raised a further complication.

[00:04:41]Dark energy may not be constant.

[00:04:44]If it changes over time, if it strengthens or weakens, then the long-term fate of the universe is not guaranteed.

[00:04:52]Endless expansion is one possibility.

[00:04:54]Others are not.

[00:04:56]The dark ages, the first stars, and the galaxies that shouldn't exist.

[00:05:02]After the CMB radiation was released, the universe entered what cosmologists call the cosmic dark ages.

[00:05:10]For hundreds of millions of years, there were no stars, no galaxies, no light of any kind.

[00:05:17]Only slowly cooling gas drifting through a darkening void.

[00:05:22]Then gravity did its patient work.

[00:05:25]Gas condensed.

[00:05:26]Temperatures climbed. And the first stars ignited. [music] Enormous short-lived giants burning at intensities our [music] sun could never match.

[00:05:37]They lived fast and died violently, exploding as supernovae, seeding the cosmos with the first heavy elements, carbon, oxygen, iron, the raw material for everything that followed.

[00:05:52]Their light ended the dark ages and transformed the universe permanently.

[00:05:57]Today, the James Webb Space Telescope, JWST, allows us to look back at this era with unprecedented clarity.

[00:06:06]By capturing faint infrared light from galaxies billions of light-years away, Webb is giving astronomers their first direct glimpse of the universe's earliest chapters.

[00:06:18]And what they are finding is deeply puzzling. Galaxies are appearing earlier, brighter, and more structurally mature than any current model predicted.

[00:06:28]A 2023 analysis identified six candidate galaxies existing just 500 to 700 million years after the Big Bang with stellar masses rivaling our modern Milky Way.

[00:06:43]Structures [music] that, under the standard model of cosmic evolution, should not have had time to form.

[00:06:49]Astronomers nicknamed them universe breakers.

[00:06:53]The name is not hyperbole.

[00:06:55]The Hubble tension, Webb's impossible galaxies, are not the only challenge facing modern cosmology.

[00:07:01]There is a second, equally serious problem that has been quietly building for years.

[00:07:07]A fundamental disagreement about how fast the universe is expanding.

[00:07:12]The Hubble constant measures the rate of cosmic expansion.

[00:07:16]Theoretical calculations derived from the CMB predict it should be approximately 67 km/s per megaparsec.

[00:07:25]But, every time astronomers calculate it from direct observations using supernovae, variable stars, gravitational lensing, they get a consistently higher value, around 73 km/s per megaparsec.

[00:07:43]Web's latest observations have not resolved this discrepancy.

[00:07:48]They have deepened it. This 9% gap, known as the Hubble tension, is not a measurement error.

[00:07:56]Both methods have been checked, cross-checked, and refined.

[00:08:00]The numbers simply don't agree.

[00:08:02]Either something is wrong with our understanding of the early universe, or something is wrong with our understanding of the universe today.

[00:08:11]Possibly both. Was the Big Bang the beginning or a transition?

[00:08:16]The universe keeps presenting puzzles that resist simple answers, which has led a growing number of physicists to ask a deeper question.

[00:08:26]What if the Big Bang wasn't the beginning of everything, but merely a transition from something that came before?

[00:08:33]One prominent framework is quantum gravity cosmology, which proposes that the singularity never actually occurred.

[00:08:41]Instead, in the extreme conditions of the early universe, quantum effects prevent infinite densities [music] from forming.

[00:08:50]The universe reaches a minimum size, then rebounds.

[00:08:55]This is called the Big [music] Bounce.

[00:08:58]A previous cosmic phase collapsing, then exploding outward into what we experience as our universe.

[00:09:05]In this model, time never had a beginning.

[00:09:08]It simply passed through a transformation.

[00:09:11]Another possibility, more radical and still contested, comes from Nobel Prize winning physicist Sir Roger Penrose. His theory, conformal cyclic cosmology, CC, proposes that the universe moves through infinite cycles of death and renewal.

[00:09:29]At the end of each cycle, all matter decays into pure energy, massless photons in an infinite void.

[00:09:37]At that point, Penrose argues, the concepts of time and distance lose all meaning. A universe with no meaningful scale becomes mathematically equivalent to a universe at the moment of a new Big Bang.

[00:09:51]The extraordinary claim.

[00:09:53]Penrose believes he has already found physical evidence of this. In the cosmic microwave background, his team identified subtle circular patterns, rings of anomalous temperature, that appear in data from both the Planck and WMAP satellites independently. He calls them Hawking points, the imprints of supermassive black holes from a previous universe whose Hawking radiation carried forward into ours, leaving faint circular echoes in our oldest light.

[00:10:28]Not everyone in the scientific community is convinced.

[00:10:32]Many argue the circular patterns are statistical noise, patterns our pattern-hungry brains impose on random variation.

[00:10:41]But Penrose notes that black holes themselves were once dismissed as mathematical fantasies.

[00:10:47]Today, >> [music] >> we photograph them directly.

[00:10:51]The radical idea of one generation has a habit of becoming the textbook of the next.

[00:10:56]What is nothing really?

[00:10:59]This brings us back to the original question.

[00:11:02]Did nothing exist before the Big Bang?

[00:11:05]Modern physics suggests the answer may be nothing is not what we think it is.

[00:11:11]Even the vacuum of empty space is not truly empty.

[00:11:16]At the quantum level, space seethes with [music] activity.

[00:11:20]Fields fluctuating, virtual particles briefly appearing and annihilating, energy rising and falling in the span of an instant.

[00:11:29]Absolute nothingness, a complete absence of everything, including quantum fields and space-time, may be physically impossible. A concept our minds invented because confronting the genuine unknown is harder.

[00:11:46]Perhaps the universe arose from a quantum fluctuation beyond the boundary of our space-time.

[00:11:52]Perhaps it rebounded from a previous cosmos. Perhaps time is part of a larger structure, one that our current mathematics cannot yet describe. Or perhaps the question itself contains a hidden flaw, the assumption that before must mean something when applied to the origin of time.

[00:12:12]The edge of what we know, the Big Bang theory, is one of the most successful scientific frameworks ever constructed.

[00:12:20]It explains explains the expansion of space, the existence and structure of the cosmic microwave background, the abundance of light elements forged in the first few minutes, and the large-scale architecture of the universe with remarkable precision.

[00:12:38]Its foundations are not in question.

[00:12:41]What is in question, what Webb is actively forcing into question, is the story of the first billion years, the nature of the singularity, and whether what we call the beginning is truly a beginning or simply the edge of what our current instruments can reach.

[00:12:57]Science has not answered what came before the Big Bang.

[00:13:01]It has done something more valuable.

[00:13:04]It has shown us that the universe is far stranger, deeper, and more subtle than our intuitions allow. Every time we extend our reach with better telescopes, bolder theories, more careful measurements, reality reveals a new layer we hadn't suspected. The deepest question may not be how the universe began. It may be whether beginning is even the right word for what happened.

[00:13:32]And whether we are bold enough to consider the alternatives.