What is *The Order of Time* by Carlo Rovelli about?

*The Order of Time* explores the illusory nature of time through physics and philosophy, arguing that time isn’t fundamental but emerges from quantum interactions. Rovelli dismantles concepts like chronological flow, explaining entropy, quantum gravity, and relativity. The book blends scientific rigor with poetic reflections on human temporality, proposing a “thermal time” hypothesis where time arises from thermodynamic processes.

Who should read *The Order of Time*?

This book suits readers fascinated by theoretical physics, philosophy, or accessible science writing. It’s ideal for those seeking insights into quantum gravity, spacetime, or existential questions about reality. Fans of Rovelli’s *Seven Brief Lessons on Physics* or works by Stephen Hawking will appreciate its balance of clarity and depth.

Is *The Order of Time* worth reading?

Yes—it’s a *New York Times* bestseller praised for making complex physics engaging. While some critics dispute Rovelli’s conclusions, the book’s exploration of time’s subjectivity and its ties to human emotion offers profound interdisciplinary value. Over 500,000 copies sold globally attest to its impact.

What is Carlo Rovelli’s thermal time hypothesis?

Rovelli argues time isn’t inherent to reality but emerges from thermodynamic entropy (“thermal time”). This framework suggests time flows because we perceive irreversible heat dispersion, not from fundamental laws. It’s central to his work reconciling quantum mechanics and general relativity.

How does *The Order of Time* explain entropy?

Entropy—the measure of disorder—drives time’s arrow. Rovelli illustrates how low-entropy early universe conditions create the illusion of time’s unidirectional flow. He links this to quantum gravity, showing entropy’s role in shaping spacetime structure.

What are key quotes from *The Order of Time*?

- **“The world is made of events, not things.”** - **“Time is ignorance.”** - **“We are processes… events linked in memory and anticipation.”** These lines encapsulate Rovelli’s view of time as a human-constructed narrative.

How does *The Order of Time* compare to *Seven Brief Lessons on Physics*?

While *Seven Brief Lessons* introduces foundational physics concepts, *The Order of Time* delves deeper into quantum gravity and temporal philosophy. Both blend lyrical prose with science, but *The Order of Time* offers more technical detail suited for advanced readers.

What criticisms exist about *The Order of Time*?

Some physicists argue Rovelli overstates time’s illusory nature, dismissing phenomenological experiences. Critics also note his thermal time hypothesis remains speculative, lacking experimental proof. Philosophers challenge his rejection of objective temporality.

The Order of Time

Carlo Rovelli

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Overview of The Order of Time

Time isn't what you think. Carlo Rovelli's mind-bending journey through physics reveals how time flows differently across the universe. Einstein's relativity comes alive in this 15-minute Blinkist favorite, challenging our perception of reality through events, not things.

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Chapter 1

When Time Unravels: The Mystery at the Heart of Our Existence

Time is perhaps humanity's greatest enigma. We inhabit it like fish in water, yet the more closely we examine it, the more it seems to slip through our fingers. Carlo Rovelli's exploration of time's true nature reveals a startling truth: the familiar, flowing time we experience bears little resemblance to time's actual structure. This revelation connects to profound questions about consciousness, cosmology, and existence itself. The Order of Time has captivated readers worldwide since its publication, with figures from Benedict Cumberbatch (who narrated the audiobook) to Barack Obama listing it among their favorite reads. Its elegant prose and accessible approach to complex physics have made it a cultural touchstone, bridging the gap between scientific understanding and human experience. As we journey through Rovelli's insights, we confront a question both scientific and deeply personal: what am I actually listening to when I pause and listen to the passing of time?

Chapter 2

The Crumbling of Time's Foundations

Our intuitive understanding of time is that of a simple, uniform flow-a cosmic river carrying all existence from past to future at the same rate. This comforting image has been systematically dismantled by modern physics, revealing time to be not a singular entity but a complex collection of structures and layers. The first shocking discovery: time passes at different rates depending on where you are. This isn't a metaphor or philosophical musing-it's measurable reality. A clock placed on the floor runs slightly slower than one on a table. A person living in the mountains ages faster than someone living at sea level. The difference is minuscule for everyday heights, but absolutely real and precisely measurable with today's atomic clocks. Einstein understood this phenomenon a century before we could measure it. He realized that massive objects like Earth modify the structure of time around them, slowing it down in their vicinity. This warping of time explains gravity itself-objects fall because they naturally move toward where time passes more slowly, just as we might tumble headfirst into waves when running into the sea. In interplanetary space, where time passes uniformly, things don't fall but float. The Greek philosopher Anaximander intuited twenty-six centuries ago that things transform "according to the order of time." This phrase became foundational to science-from astronomy to physics, equations describe how phenomena evolve in time. But Einstein revealed a profound complication: there is no single time. Each clock has its own "proper time," and these times evolve relative to each other. The world isn't a platoon marching to one commander's pace but a network of events with innumerable times. Physics doesn't describe how things evolve "in time" but how they evolve in their own times, and how these times relate to each other. Time has lost its unity-it has different rhythms everywhere, like ten thousand dancing Shivas moving to different beats.

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Chapter 3

When Past and Future Blur

While clocks may run at different speeds in different places, there's a more essential aspect to time-its directionality. The past and future feel fundamentally different to us: the past cannot be changed while the future remains open with possibilities. But surprisingly, most laws of physics make no distinction between past and future. Newton's mechanics, Maxwell's electromagnetism, Einstein's relativity, quantum mechanics-none of these fundamental equations recognize time's arrow. If you watch a film of two billiard balls colliding and then reverse it, both versions look equally plausible. Only one basic law of physics distinguishes past from future, and it involves heat. The story begins with Sadi Carnot, who studied steam engines in the early 1800s. His work eventually reached Rudolf Clausius, who formulated a crucial law: heat cannot pass from a cold body to a hot one if nothing else changes. This is the only basic law of physics that distinguishes past from future. Every instance where past differs from future involves heat. Friction produces heat when a ball stops rolling; thinking produces heat in our brains. Clausius introduced "entropy" to measure this irreversible progress of heat in one direction. The equation S >= 0, known as the second principle of thermodynamics, is the only equation in fundamental physics that knows any difference between past and future-the mathematical expression of time's arrow. Ludwig Boltzmann revealed that entropy exists because we describe the world in a blurred fashion. The difference between past and future doesn't lie in nature's deep grammar but in natural disordering that leads to less particular situations. In a microscopic description, there's no distinction between past and future, no difference between cause and effect. Our vivid perception of time's passage depends on our inability to apprehend the world in all its minute detail. Boltzmann, precariously balanced between enthusiasm and depression throughout his celebrated yet criticized career, ultimately hangs himself at Duino, the same place where Rilke would later write his Elegy-a tragic end for the man who helped us understand time's most fundamental asymmetry.

Chapter 4

The Illusion of Now

Ten years before understanding that mass slows time, Einstein discovered that speed does the same. For everything that moves, time passes more slowly. This effect becomes perceptible at very high velocities and was first measured in the 1970s using precision watches on airplanes. A moving object experiences shorter duration-watches mark fewer seconds, plants grow more slowly, young men dream less. But Einstein's most disorienting discovery was that the concept of "now" across distance is fundamentally meaningless. When observing someone nearby, light takes nanoseconds to reach us, showing us what happened moments ago. With greater distances, this becomes significant-looking at someone on Proxima b means seeing what happened four years ago, not what's happening "now." We cannot define a universal present-it's like asking which football team won a basketball championship or how much a musical note weighs. Our "present" is merely a bubble around us, extending only as far as our ability to measure time precisely allows. Between our past and future lies an "expanded present"-fifteen minutes on Mars, eight years on Proxima b, millions of years in the Andromeda galaxy. The temporal structure of the universe resembles family genealogy-a partial ordering rather than a complete one. Just as a person has ancestors and descendants, with many people being neither, every event in the universe has its past, future, and events that are neither past nor future. In reality, the expanded present is extremely brief at human scales, appearing as a thin horizontal band we call "the present." Near black holes, time slows dramatically until it stands still at the horizon, making escape impossible since objects can only move toward the future. More than a century after learning that a universal "present" doesn't exist, we still struggle with this concept, as it undermines our intuitive understanding of what "exists" in the universe.

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Chapter 5

Time's Relationship with Space

Our personal experience of time is remarkably elastic. While ancient civilizations used sundials and water clocks, these didn't dominate life as modern clocks do today. Only in fourteenth-century Europe did mechanical clocks begin regulating collective activities, with cities building clock towers beside churches to mark communal rhythms. Time gradually shifted from the domain of angels to mathematicians, illustrated by Strasbourg Cathedral's two sundials-one topped by an angel (from 1200) and another by a mathematician (from 1400). For centuries, clocks weren't synchronized between locations-each town kept its own local time based on when the sun reached its midday position. Venice's clocks ran a half hour ahead of Turin's, and even Paris train stations kept their own time as courtesy to late travelers. Only in the nineteenth century, with the advent of telegraphs and trains, did standardized time zones emerge as a compromise between universal time and local customs. Just as with time, our conception of space presents a fundamental tension between two philosophical giants. Aristotle defined space as simply what surrounds a thing-the place of something is what contains it. Newton, however, proposed "absolute, true, and mathematical" space that exists independently of objects, even where nothing exists. The synthesis between Aristotle's time and Newton's is Einstein's crowning achievement. Einstein revealed that Newton was right that time and space exist beyond tangible matter-they are real phenomena. But Newton was wrong that they're independent from what happens. The world isn't just drawn on Newton's canvas; the canvas itself is made of the same substance as everything else: fields. The gravitational field is the texture that forms Newton's space and time-it's the fabric on which the world is drawn. Spacetime is the gravitational field, existing by itself but not different from other things. It flexes, stretches and jostles with other fields, pushing and pulling against them. This field can be smooth and flat as Newton described, or it can undulate in gravitational waves, contract and expand. Clocks slow down near mass because there is literally "less" gravitational field there-less time. Einstein's synthesis shows both giants were partially right: Newton correctly intuited something exists beyond visible moving things, but wrongly assumed it was independent and imperturbable. Aristotle correctly understood that "when" and "where" are always relational, but this relation can be to Einstein's dynamic spatiotemporal field.

Chapter 6

When Time Becomes Granular

The strange landscape of relativity becomes even more alien when we consider quantum properties of space and time. Quantum mechanics introduces three fundamental discoveries that further demolish our concept of time: granularity, indeterminacy, and the relational aspect of physical variables. Time measured by a clock is quantized-it acquires only certain values, not others, making time granular rather than continuous. For the gravitational field, this minimum scale is called "Planck time"-approximately 10^-44 seconds, an unimaginably tiny fraction of a second where quantum effects on time become manifest. This means most values of time simply don't exist. Duration isn't continuous but discontinuous, jumping kangaroo-like between discrete values. Below this minimum interval, the notion of time doesn't exist at all. The world isn't drawn with continuous lines but sketched in dots, like a Seurat painting. This idea isn't new-Isidore of Seville, the Venerable Bede, and Maimonides all proposed granular time centuries ago. The spatial equivalent is Planck length (10^-33 centimeters), the minimum limit below which length becomes meaningless. Quantum mechanics' second discovery is indeterminacy-the impossibility of precisely predicting, for instance, where an electron will appear tomorrow. Between appearances, the electron has no precise position, existing in a "superposition" of positions like a probability cloud. Since spacetime is a physical object like an electron, it too fluctuates and can exist in superpositions of different configurations. We must imagine spacetime as a blurred superposition of different possible geometries. The distinction between present, past, and future becomes fluctuating and indeterminate-an event may be both before and after another one. Fluctuation doesn't mean events are never determined-rather, they become determined only at certain moments, in unpredictable ways. When an electron interacts with something, it materializes at a specific point, but this concreteness exists only in relation to what it interacts with. For everything else, the interaction spreads indeterminacy. This relational concreteness is quantum mechanics' most radical discovery. Time has dissolved into a network of relations that no longer forms a coherent whole-spacetimes fluctuating and superimposing, materializing only in relation to particular objects.

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Chapter 7

A World of Events, Not Things

Though time as we knew it has crumbled, one truth remains: the world is nothing but change. The absence of time in fundamental equations doesn't mean a frozen world-it means change without Father Time's ordering. Events crowd chaotically, like Italians rather than orderly English queues. The best grammar for understanding reality is becoming, not being. We can view the world as made of things (substances, entities) or events (happenings, processes). Modern physics confirms the latter view. Even seemingly permanent "things" are actually long events-a stone is a complex quantum field vibration, a momentary equilibrium of forces before disintegrating. The world works better as a network of events than a collection of things. A storm, cloud, wave, family, or human-none are things but processes, relations, occurrences. Physics has sought some primary substance but found the world more intelligible through relations between events. As Anaximander suggested, we understand the world by studying change. Those who ignored this advice paid dearly. Plato and Kepler both erred by focusing on static forms rather than dynamics. Plato tried describing atoms' shapes using the five regular polyhedra; Kepler initially thought these determined planetary orbits. Both were wrong because they ignored change. Successful physics-from Newton to Schrodinger-describes how things change, not how they are. "Things" are merely events that remain monotonous for a while before returning to dust. The absence of time doesn't mean immobility but that happening isn't ordered along a timeline-it's a boundless network of quantum events, more like Naples than Singapore. We typically call "real" only what exists now, in the present. Philosophers term this view "presentism"-the idea that only the present is real while past and future are not. But this concept fails when we realize the present isn't globally defined but only exists approximately in our vicinity. The temporal structure of reality is more complex than our grammar allows us to express. Change is real, but doesn't follow a global order. Our language struggles with a world where an event "has been" relative to me but "is" relative to you-just as ancient writers struggled to describe how "up" and "down" change meaning on a spherical Earth.

Chapter 8

Time Is Born from Ignorance

If time isn't fundamental to the world's elementary structure, what exactly is this thing we humans call "time"? What does my watch measure? What is it that always runs forward and never backward? Time, like many phenomena, emerges from a world that fundamentally lacks it. Just as cats aren't elementary ingredients of the universe but complex emergent entities, just as football teams form through organizing procedures, just as "high" and "low" emerge only in relation to large masses like Earth, time emerges from a timeless quantum reality. In thermal systems, all variables continuously change except one: the total energy, which remains conserved. Energy and time form a "conjugate" pair in physics-knowing a system's energy tells us how time flows, as the equations of evolution follow from energy's form. A system in thermal agitation passes through all configurations with the same energy, creating what we perceive as a "state of equilibrium"-like a placid glass of hot water. But instead of viewing time as absolute and objective, we can understand it as emerging from our macroscopic, blurred vision of reality. A macroscopic state (which ignores microscopic details) determines a particular variable that functions as time. This is a key point: the blurring itself determines time. When we ignore microscopic details, like the countless molecules in a glass of water, we create entropy. But more fundamentally, this blurring determines time itself. In relativistic physics, it's not that time determines the state-the state (the blurring) determines time. This "thermal time" behaves most like what we call "time" in relation to macroscopic states, but it's not universal-it's determined by the incompleteness of our description. Roger Penrose suggests that quantum interactions might explain our experience of time's flow. Alain Connes points to quantum mechanics' "noncommutativity" as fundamental to time's nature-when measuring quantum properties like position and speed, the order matters. This noncommutativity creates a natural ordering of events-a primitive form of temporal order. Time emerges from our ignorance-both quantum indeterminacy and the complexity of molecular systems create blurring that generates temporality. Time is, ultimately, the expression of our ignorance of the world.

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Chapter 9

The Universe Through Our Eyes

We humans are pieces of nature interacting with only a tiny fraction of the universe's variables. This limited interaction creates a blurring that gives rise to concepts like heat and entropy. Importantly, entropy isn't subjective but relative-it depends on the physical interactions between systems. Like speed, which is measured relative to something else (a child running on a train has one speed relative to the train and another relative to the ground), entropy is relative. The entropy of A with regard to B counts the configurations of A that physical interactions with B cannot distinguish. Perhaps the universe wasn't in a special low-entropy configuration in the past. Maybe we are the special ones-our particular way of interacting with the universe determines a macroscopic description that makes entropy appear low in the past. Just as we once thought the heavens revolved around us before realizing we were turning, time's arrow might be a perspective effect. In a vast universe with countless interacting systems, some will inevitably interact with variables that happened to have particular values in the past. For these special subsets, the universe's entropy appears low in the past, allowing for the second law of thermodynamics, memories, traces-and ultimately evolution, life, and thought. We belong to such a subset. The flow of time may not be universal but a product of our particular perspective. Science aspires to objectivity, but we must remember that our experience comes from within. Every observation is made from a particular perspective, and ignoring this fact can lead to confusion. Like a map that needs a "You Are Here" marker to be useful, our descriptions of the world require indexicality-words like "here," "now," and "I" that change meaning depending on who uses them and when. These indexical terms acknowledge that point of view is an essential ingredient in describing the observable world. We observe the universe from within, interacting with only a minuscule portion of its innumerable variables, resulting in a blurred image. This blurring suggests that the dynamic of the universe with which we interact is governed by entropy-which measures something that relates more to us than to the cosmos itself.

Chapter 10

Time, Memory, and the Human Experience

What are we as human beings? If the world consists of events rather than entities, what am "I"? The Buddhist text Milinda Panha addresses this question through a dialogue between King Milinda and the sage Nagasena, who claims there is no person behind his name-just a designation. When the king challenges this view by asking if the person is in the hair, nails, sensations, or perceptions, Nagasena counters by asking if a chariot is its wheels, axle, or chassis. The king concedes that "chariot" refers only to the relationship among parts working together-there is no entity "chariot" beyond these relations. The first ingredient of our identity is that each of us identifies with a point of view in the world. The world is reflected in us through a rich spectrum of correlations essential for survival. Each person is a complex process that reflects the world and integrates the information we receive. The second ingredient works like the chariot. In reflecting the world, we organize it into entities by grouping and segmenting it to better interact with it. We draw boundaries and approximate the world by breaking it into pieces. Our nervous system works this way-receiving stimuli, processing information, and generating behavior through networks of neurons that form flexible dynamic systems. These neural networks evolve by associating stable fixed points with recurring patterns in incoming information. "Things" and "concepts" are fixed points in neuronal dynamics, induced by recurring structures in sensory input. They mirror aspects of the world based on recurrent structures and their relevance to us. The third essential ingredient of our identity is memory-the thread linking our present to our past. We are not independent processes in successive moments, but narratives of ourselves. I am not just this momentary mass of flesh; I am my thoughts, my mother's caresses, my father's guidance, my travels, readings, loves, despairs, friendships. I am what I've written and heard, the faces engraved in my memory. Without these memories, would I still exist? Memory solders together the scattered processes across time of which we are made. Our brains function as time machines, collecting memories of the past to predict the future across various timescales. This evolutionary advantage places us in a state of being between past and future events-what we experience as the "flow" of time. Our perception doesn't capture the present moment but rather something that extends in time, condensed in our brains as duration. Saint Augustine recognized this, noting that we are always in the present while past and future exist within our minds. Like Augustine's example of listening to music, where meaning comes from sounds before and after, our consciousness operates through memory and anticipation. This space of memory combined with anticipation gives us our sense of time and selfhood. Time opens our limited access to the world, forming our identity-and also becoming the source of our suffering. As Buddha taught, suffering comes from attachment to what must end. We long for timelessness yet endure time's passing. We began with the familiar image of time as something flowing uniformly throughout the universe. This picture has disintegrated. There is no universal present-events are only partially ordered, with the present being localized rather than global. Time passes at different speeds depending on mass and velocity. The gravitational field determines time's rhythms, forming a great "jelly" in which we're immersed. Yet at the quantum level, even this spacetime is an approximation-there's neither space nor time, only processes transforming physical quantities. From this timeless fundamental world, our perception of time emerges through our partial interaction with reality, creating thermal time and entropy that quantifies uncertainty. What we call "time" is just one variable describing the world-at our scale, quantum fluctuations are imperceptible and spacetime appears rigid. Our emotional relationship with time has spawned religions and philosophies, but physics helps us penetrate the mystery. Perhaps the emotion of time is precisely what time is for us-we are memory, nostalgia, and longing. This clearing opened by memory and anticipation is time: sometimes anguishing but ultimately a tremendous gift allowing us to exist.

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Key Themes in The Order of Time

thermal time hypothesis
entropy and arrow of time
quantum gravity
loop quantum gravity
nature of reality

Quotes from The Order of Time

The difference between past and future, between cause and effect, between memory and hope, between regret and intention… in the elementary laws that describe the mechanisms of the world, there is no such difference.
The world isn't a collection of things, it's a collection of events.
Time is perhaps humanity's greatest enigma.
The world isn't a platoon marching to one commander's pace but a network of events.

Characters in The Order of Time

Carlo RovelliAuthor and physicist exploring the nature of time
Ludwig BoltzmannPhysicist who linked entropy to time's arrow
Rudolf ClausiusPhysicist who formulated the law of entropy
AnaximanderGreek philosopher who intuited the order of time

About the Author

Carlo Rovelli, theoretical physicist and bestselling author of The Order of Time, is renowned for translating complex scientific concepts into accessible narratives.

A pioneer of loop quantum gravity, Rovelli bridges physics and philosophy in his exploration of time’s elusive nature. His insights draw from decades of research at Aix-Marseille University and previous roles at the University of Pittsburgh and Yale.

His works, including Seven Brief Lessons on Physics and Reality Is Not What It Seems, have sold millions worldwide, with Seven Brief Lessons translated into 41 languages.

Recognized as one of Foreign Policy’s 100 Most Influential Global Thinkers (2019), Rovelli frequently contributes to major publications like The New York Times and The Guardian. The Order of Time has been a global bestseller since its 2018 release, praised for merging scientific rigor with poetic reflection.

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"Reading used to feel like a chore. Now it’s just part of my lifestyle."

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Chapter 10

The Order of Time

OverviewOverview of The Order of Time

One book. Many ways to hear it.

When Time Unravels: The Mystery at the Heart of Our Existence

The Crumbling of Time's Foundations

See every word as you hear it

When Past and Future Blur

The Illusion of Now

Get more out of The Order of Time

Time's Relationship with Space

When Time Becomes Granular

See every word as you hear it

A World of Events, Not Things

Time Is Born from Ignorance

Get more out of The Order of Time

The Universe Through Our Eyes

Time, Memory, and the Human Experience

You made it to the end of The Order of Time

Key Themes in The Order of Time

Quotes from The Order of Time

Characters in The Order of Time

About the Author

Download Summary of The Order of Time

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FAQs About This Book

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1,000,000+ curious minds.

1,000,000+ curious minds.

One book. Many ways to hear it.

When Time Unravels: The Mystery at the Heart of Our Existence

The Crumbling of Time's Foundations

See every word as you hear it

When Past and Future Blur

The Illusion of Now

Get more out of The Order of Time

Time's Relationship with Space

When Time Becomes Granular

See every word as you hear it

A World of Events, Not Things

Time Is Born from Ignorance

Get more out of The Order of Time

The Universe Through Our Eyes

Time, Memory, and the Human Experience

You made it to the end of The Order of Time

Users also liked

Discover more

Overview of The Order of Time