The age of
the universe.

What the data says.
13.8 billion years.

Modern cosmology has measured the age of the universe with extraordinary precision. The number is not a guess. It is the result of multiple independent lines of measurement that converge on the same answer.

How the age is measured

The primary measurement comes from the Cosmic Microwave Background (CMB). This is the afterglow of the Big Bang, a faint radiation that fills the entire sky. It was emitted about 380,000 years after the Big Bang, when the universe had cooled enough for electrons to bind to atomic nuclei and the universe first became transparent to light. Before this moment, the universe was an opaque plasma. After it, photons could travel freely. Those photons have been travelling for 13.8 billion years, and when we detect them today they have been redshifted into the microwave part of the spectrum. The temperature of this radiation is 2.725 Kelvin. That is 2.725 degrees above absolute zero. The entire sky glows at this temperature.

The COBE satellite (1992) first detected tiny variations in this glow. Temperature differences of about one part in 100,000. The WMAP satellite (2001-2010) mapped these variations in finer detail. Then the Planck satellite, launched by the European Space Agency, mapped this radiation in unprecedented detail across the full sky from 2009 to 2013. Its 2018 final data release gave the most precise age yet: 13.787 ± 0.020 billion years. The uncertainty is 20 million years. That is a precision of 0.15 percent. The age of the universe is known more precisely than the age of many archaeological sites on Earth. [1]

The CMB does not give a direct age reading. It gives a map of density and temperature fluctuations. These fluctuations are the imprint of quantum fluctuations from the earliest moments of the universe, stretched by inflation to cosmic scales. From this map, cosmologists extract six parameters, including the density of matter, the density of dark energy, and the Hubble constant. These parameters are fed into a model called ΛCDM , Lambda Cold Dark Matter. The model traces the universe backwards in time. When the density tends to infinity, that is T = 0. The elapsed time from T = 0 to the CMB emission (380,000 years) plus the time from CMB emission to the present, calculated using the expansion history, gives the age.

The expansion method

A second independent method uses the expansion rate of the universe. The Hubble constant (H₀) measures how fast the universe is expanding today. If you know the expansion rate and the contents of the universe, you can calculate backwards to find when everything was at a single point. This gives an age. Measurements of H₀ from Type Ia supernovae, Cepheid variable stars, and gravitational lensing time delays give values around 73 kilometres per second per megaparsec. This gives an age of approximately 13.8 billion years but with larger uncertainty than the CMB. Interestingly, the H₀ value from the CMB (about 67.4) differs from supernova measurements (about 73). This discrepancy, called the "Hubble tension," is an active area of research. It does not affect the age estimate by more than a few hundred million years. The universe is unambiguously very old. [2]

Stellar archaeology

A third method measures the ages of the oldest stars. Globular clusters are dense spherical collections of hundreds of thousands of stars, found in the halo of our galaxy. They contain the oldest known stars. Stellar ages are measured by plotting stars on a Hertzsprung-Russell diagram , luminosity against surface temperature , and comparing the observed sequence to computer models of stellar evolution. As a star ages, it moves through predictable stages. Main sequence, red giant, horizontal branch, white dwarf. The turnoff point from the main sequence gives the cluster age. The oldest known globular clusters, such as Messier 92 and NGC 6397, are about 12.5 to 13.5 billion years old. They cannot be older than the universe, and the numbers are consistent. Additionally, the cooling ages of white dwarf stars , the remnants of stars like the Sun , give independent ages of around 12 to 13 billion years for the oldest stellar populations in our galaxy. [3]

A fourth line comes from radioactive dating of stars. Certain metal-poor stars contain thorium and uranium isotopes with half-lives of billions of years. Measuring the current abundance of these isotopes and comparing to the expected initial abundance gives stellar ages around 13 billion years. Adding the time from the Big Bang to the first stars (about 200 to 400 million years) gives a total consistent with 13.8 billion years. Four independent methods. One answer. The universe is old.

The Lambda-CDM model

All these methods converge because they are embedded in a single theoretical framework: the ΛCDM model. This is the standard model of cosmology. It describes a universe that began hot and dense, expanded, and whose expansion is now accelerating under the influence of dark energy (the Λ, Lambda). The universe consists of roughly 68 percent dark energy, 27 percent dark matter, and 5 percent ordinary matter. The model makes specific predictions about the CMB power spectrum, the large-scale distribution of galaxies, and the abundances of light elements. Each prediction has been tested and confirmed to within a few percent. The age of 13.8 billion years is not a free parameter. It falls out of the model when the other parameters are measured. Anyone who wants to challenge the age of the universe must challenge the entire edifice of modern cosmology, from general relativity to nuclear physics to the CMB. No credible alternative does so.

The timeline of cosmic history

What follows is a timeline of the universe as reconstructed by modern cosmology. Each stage represents a distinct physical regime. The numbers are not final. Science revises its measurements. But the broad outline is supported by multiple converging lines of evidence.

What the Quran says.
Six stages.

The Quran describes the creation of the heavens and the earth in six stages. It does not call them days. The Arabic word is ayyam, which carries the meaning of periods, units, or stages.

The verses

"Yawm" does not mean 24-hour day

The Arabic word yawm (plural ayyam) has a range of meanings in the Quran. It can refer to a 24-hour day. It can refer to a longer unit: "a day with your Lord is like a thousand years of what you count" (22:47). It can refer to an epoch: "a day whose measure is fifty thousand years" (70:4). It can refer to the Day of Judgement, whose length is beyond human reckoning. The Quran itself uses the word for periods of vastly different lengths. A 24-hour day before the sun and the earth existed is a physical impossibility. The notion of a literal 24-hour day of creation is not in the text. It is read into the text by people who assume the English word "day" has only one meaning. [6]

Consider the physical context. A 24-hour day is defined by the Earth's rotation relative to the Sun. Before the Earth existed, before the Sun existed, before there was an Earth to rotate or a Sun to measure rotation against, the concept of a 24-hour day has no physical referent. The first three "days" of creation in the Genesis account describe evening and morning before the Sun was created on the fourth day. This is a logical problem for a literal reading of Genesis. It is not a problem for the Quran, because the Quran does not describe evening and morning. The Quran uses the word ayyam, which is inherently flexible. A yawm is a unit of time whose length is determined by context. When the context is the creation of the cosmos, and the Sun and Earth do not yet exist, yawm cannot mean a solar day. It must mean a stage, an epoch, a period.

Classical commentators recognised this flexibility. Al-Razi, in his Tafsir al-Kabir, noted that the word yawm in the creation verses means a period of time, not a day defined by sunrise and sunset, because the sun had not yet been created. Ibn al-Jawzi listed multiple opinions: that the ayyam were like earthly days, that each was a thousand years, and that they were periods whose length only Allah knows. Al-Qurtubi similarly recorded multiple views without fixing one. The classical tradition did not speak with one voice on this question. The diversity of opinion is itself evidence that the text is open. Modern readers who insist on a literal 24-hour day are imposing a meaning the Arabic does not require.

Other Quranic cosmology

The Quran contains several other verses relevant to cosmology. "Do not the disbelievers see that the heavens and the earth were joined together, and We split them apart?" (21:30). The Arabic word ratq means something sewn together, sutured, fused. The word fataq means to split, tear apart, unstitch. The imagery is of two things that were one being separated. This is strikingly consistent with the central idea of the Big Bang: that the universe began as a single point, or a single state, from which space, time, matter, and energy unfolded. It is not a scientific description. It is a vivid image directed at an audience that had no conception of cosmology. Read literally, it describes exactly what the Big Bang model describes: an initial unified state that separated into the cosmos we observe. [7]

"And the heaven We constructed with strength, and indeed, We are its expander" (51:47). The verb musi'un comes from the root w-s-', meaning to make wide, to expand. The verse says the universe is being expanded. Edwin Hubble discovered the expansion of the universe in 1929. The Quran said it fourteen centuries earlier. This is not a coincidence that can be dismissed easily. The verse uses the present tense for an ongoing action. The universe is expanding. Not expanded. The grammar and the physics match.

What the Quran is not

The Quran is not a cosmology textbook. It does not provide a mathematical description of cosmic inflation. It does not name the fundamental forces. It does not calculate the density parameter. Its purpose is theological. It tells the reader that the universe was created, not eternal. That it was created by a single Creator, not by a pantheon. That it was created deliberately, with measure and purpose, not randomly. That the Creator continues to sustain it. That it will have an end. These are theological claims. They are consistent with modern cosmology. They neither confirm nor contradict the specific numbers that cosmology produces. The Quran gives the meaning. Science gives the mechanism. A Muslim can accept both without contradiction.

Why stages matter.
The One who made it.

Creation in stages is a fundamental concept in both the Quran and modern cosmology. The Creator works through processes. The processes unfold over time. This is not a contradiction. It is a convergence.

The Quran says Allah created the heavens and the earth in six stages. It also says the creation was deliberate and measured: "We created the heavens and the earth and what is between them in truth and for a specified term" (46:3). The word qadr, measure, decree, proportion, runs through the Quranic account of creation. The universe was not made haphazardly. It was made with precision. Each stage had its own character, its own duration, its own purpose.

Modern cosmology describes the same reality from the other direction. The Big Bang was not an explosion in the everyday sense. It was an expansion of space itself, proceeding through distinct physical regimes, each governed by different forces and particles. The Planck epoch. Inflation. The quark epoch. Nucleosynthesis. Recombination. Reionisation. Structure formation. The sequence is not arbitrary. It unfolds according to physical laws that were in place from the first moment.

The fine-tuning problem

There is a remarkable fact about our universe that physicists have been grappling with for decades: it appears to have been set up with extraordinary precision to allow the existence of complex structures, including life. This is called the fine-tuning problem. Consider a few of the numbers.

The density parameter (Ω) of the early universe. If the density had been slightly higher, the universe would have recollapsed within a fraction of a second. If slightly lower, it would have expanded too fast for galaxies to form. The required precision is about 1 part in 10⁶⁰. That is a 1 followed by 60 zeros. The cosmological constant, Λ, which drives the acceleration of the universe, is about 120 orders of magnitude smaller than what quantum field theory predicts. If it were larger by even a tiny fraction, galaxies would not have formed. The strength of the strong nuclear force. If it were about 4 percent stronger, all the hydrogen in the universe would have been consumed in the first few minutes, and stars would not burn. If it were about 10 percent weaker, atomic nuclei beyond hydrogen would not be stable, and the periodic table would have one element. The ratio of the electromagnetic force to the gravitational force. A shift of 1 part in 10⁴⁰ would make stars either too cool to sustain life or too hot to allow planets.

These are not religious arguments. They are published in peer-reviewed physics journals. The physicist and Nobel laureate Steven Weinberg, an atheist, acknowledged the apparent fine-tuning and found it troubling. The cosmologist Fred Hoyle, also an atheist, discovered the resonance that allows carbon to be synthesised in stars and remarked that the universe looked like "a put-up job." The physicist Lee Smolin proposed that our universe is one of many, selected by a process analogous to natural selection , because he found fine-tuning hard to accept without explanation.

The Quran's response to this is the word qadr. "Indeed, We have created everything in measure" (54:49). "He created everything and determined its determination" (25:2). The universe is measured. It runs according to laws. The constants are not random. They are set. Whether one calls the setter God, or the Mind of the Creator, or simply accepts the fact and suspends judgement on its origin, the observation remains: the universe is ordered in a way that permits life. Science discovered this. The Quran stated it. The two are saying the same thing in different languages.

The anthropic principle

The anthropic principle comes in two forms. The weak anthropic principle says: we can only observe a universe that permits our existence. This is a logical tautology. The strong anthropic principle says: the universe must have properties that allow life because it was designed to. This is a theological statement. Somewhere between them lies a genuine observation: if the constants were different, we would not be here to wonder about them. The universe appears calibrated for complexity. The calibration might be explained by a multiverse, or by design, or by some deeper theory we do not yet have. The Quran, naturally, takes the design view. But it does not rest its argument on fine-tuning. It rests its argument on the claim that the universe was created in truth, with purpose. The fine-tuning is a scientific echo of that claim. It is not proof. It is convergence.

Dividing a complex process into stages is how every human understanding works. A biologist divides embryonic development into stages. A geologist divides Earth's history into eras. A historian divides a war into campaigns. Breaking a whole into parts is how finite minds grasp large realities. The Quran's six stages are a way of saying: the Creator did not snap the universe into existence in a single instant. He made it through a process. The process was ordered. Each stage had its place. Science fills in the physical details of that process. The Quran gives its theological meaning. These are not at war. They are two languages describing the same event.

There is a deeper point here. The universe took time. It was not instantaneous. A Creator who wanted to could have made everything in a moment. The Quran says kun fa yakun: "Be, and it is." But it also says the actual creation took six stages. Why? The answer the Quran gives is that the creation was made bil-haqq, in truth, with purpose, for a reason. A process creates a history. A history creates a relationship. The universe has a story. Science tells us what happened in the story. The Quran tells us who wrote it.

Most Muslims made
science an enemy.
It is not.

Somewhere in history, the Muslim community decided that science was a threat. This was one of the most consequential errors in Islamic intellectual history.

The irony is sharp. The Creator made the universe. Science studies what the Creator made. How can studying the Creator's work be an act of disbelief? If the universe is Allah's handiwork, then understanding it is an act of worship, not an act of rebellion. The Quran repeatedly commands its readers to observe, to reflect, to travel the earth and see how creation began (29:20). It does not say "close your eyes and accept what the scholars tell you." It says: look. Think. Reason. "Indeed, in the creation of the heavens and the earth, and the alternation of the night and the day, are signs for those of understanding" (3:190). The signs are in the creation. You see them by looking at the creation. Not by looking away.

What happened

For several centuries, the Islamic world led the planet in science. The Abbasid Caliphate established the House of Wisdom (Bayt al-Hikma) in Baghdad in the late 8th century. Scholars there translated Greek, Persian, and Indian scientific texts into Arabic. They did not just translate. They corrected, extended, and transformed. Al-Khwarizmi (c. 780-850) invented algebra. The word "algebra" comes from the Arabic al-jabr, from the title of his book Kitab al-Mukhtasar fi Hisab al-Jabr wal-Muqabala. He also gave us the word "algorithm," from the Latinisation of his name. Al-Haytham (c. 965-1040) founded experimental optics. He was the first to correctly explain that vision occurs when light reflected from objects enters the eye, not when the eye emits rays. He is considered the father of the scientific method. Al-Biruni (973-1048) measured the radius of the Earth to within 1 percent of the modern value. Ibn Sina (980-1037) wrote Al-Qanun fi al-Tibb (The Canon of Medicine), which was the standard medical textbook in European universities for 500 years. Ibn al-Nafis (1213-1288) was the first to describe pulmonary circulation, the movement of blood from the heart to the lungs and back. Al-Zahrawi (936-1013) revolutionised surgery and invented dozens of surgical instruments. Jabir ibn Hayyan (c. 721-815) established experimental chemistry. These were Muslims. They did science as an act of worship. They saw no conflict between studying the natural world and believing in its Creator. [8]

What went wrong

Something shifted between the 12th and 14th centuries. Al-Ghazali (1058-1111), a towering figure, wrote Tahafut al-Falasifa (The Incoherence of the Philosophers), arguing that philosophers who relied on reason alone were led to error. His target was Greek metaphysics, not observational science. But his critique of causality , that causes do not produce effects by themselves, that God directly creates every event , was interpreted as a rejection of the very idea of natural law. If fire does not truly burn cotton, if God creates the burning at the moment of contact, then studying the physical mechanism is at best irrelevant and at worst impious. This was not Ghazali's intent. But it was the effect. Ibn Rushd (1126-1198), known in the West as Averroes, wrote a rebuttal, Tahafut al-Tahafut (The Incoherence of the Incoherence), defending the use of reason. But Ibn Rushd's works were burned, and the momentum shifted away from philosophy and natural science toward jurisprudence and mysticism. [9]

The numbers today

The consequences are measurable. Muslims make up about 25 percent of the world's population. Yet Muslims have won approximately 3 Nobel Prizes in science out of roughly 650 awarded since 1901. That is less than 0.5 percent. The 57 member states of the Organisation of Islamic Cooperation, with a combined population of nearly 2 billion, collectively produce fewer scientific papers annually than the single country of Switzerland. Israel, a country of 9 million, has more patents, more start-ups, and more scientific output than the entire Muslim world combined. Muslim-majority countries spend on average less than 0.4 percent of their GDP on research and development. The global average is 2.2 percent. South Korea spends 4.8 percent. The Muslim world is about 1.7 billion people. It produces science at a level comparable to a small European country. This is not because Muslims are less intelligent. It is because the intellectual culture of the Muslim world stopped valuing the kind of inquiry the Quran commands.

The Quran says: "Say: travel through the earth and observe how creation began" (29:20). It says: "Indeed, in the creation of the heavens and the earth and the alternation of night and day are signs for those of understanding" (3:190). It says: "Will they not reflect on the Quran?" (4:82). It says: "He created everything and determined its determination" (25:2). These are not verses that direct believers away from science. They direct believers toward it. A Muslim who studies cosmology is doing what the Quran commands. A Muslim who refuses to look is not.

The scholars' error

The scholars who told Muslims that science is an enemy of Islam committed a grave error. They confused their own interpretation of the Quran with the Quran itself. When Galileo was forced to recant his finding that the Earth moves around the Sun, it was not the Bible that forced him. It was the Catholic Church interpreting the Bible. The Bible verses in question , Psalm 93:1, "the world is firmly established, it cannot be moved," and Joshua 10:12-13, where the sun stands still , were interpreted as statements of cosmology. They were not. They were poetry and narrative. The Church's error took 359 years to admit. The Catholic Church formally acknowledged its error concerning Galileo in 1992. Muslim scholars made the same category of error. They read the Quran through the lens of their time and assumed their reading was the only possible one. When evidence arrived that contradicted their reading, they blamed the evidence. They should have questioned the reading. The Quran has proven compatible with a spherical Earth, a heliocentric solar system, an expanding universe, and a 13.8 billion year cosmic history. It has proven compatible because it does not make specific scientific claims. It makes theological claims. Those claims are compatible with any honest scientific finding because the Creator made both the book and the world.

Yet today, an estimated 70 to 80 percent of the world's Muslims hold beliefs about the natural world that the Quran does not teach. They believe the universe was made in six literal 24-hour days a few thousand years ago. They believe the earth was made before the heavens, or the heavens before the earth, in a specific sequence that they read into a text that does not specify a sequence. They believe science is an enemy of faith, a product of Western materialism, a conspiracy against Islam. None of this is in the Quran. All of it was added later by scholars who assumed their own reading was the only possible one and taught generations of Muslims to do the same.

This is not a new pattern. The same scholars who told Muslims that the universe is young also told them that the earth is flat, that the sun orbits the earth, that embryology works by a medieval theory of humours, and that rejecting these views is rejecting Islam. Each time science advanced, the scholars resisted. Each time, they were wrong. And each time, the Quran was not on their side. The Quran was on the side of what is true. The scholars were on the side of what they had already decided was true.

QASRA's position is direct. The Quran is true. Science is the systematic study of what is true. If a scientific finding is well established, it describes a reality that the Creator made. It cannot contradict the Creator's own book. If a reading of the Quran contradicts a well-established finding, the reading is wrong. Not the Quran. Not the science. The reading. The scholars who told Muslims to fear science did more damage to Islam than any external enemy. They trained generations to close their minds. The Quran commands the opposite.

The universe is old.
The Quran is true.
Both come from the
same source.

Our position follows from a simple principle: the Creator does not lie. If the data says the universe is 13.8 billion years old, the data is describing something the Creator made. The Quran does not contradict it.