This summer I read Walter Isaacson’s illuminating biography of Albert Einstein, the man who is widely considered to be the greatest thinker of the 20th Century. In 1905, when he was only 26 years old, he published four groundbreaking papers that forever changed the way people understood space, time, mass, gravity and energy.
By the time Einstein turned 40 in 1919, at a moment when he was struggling to devise a unified theory of matter, he complained to a friend that “Anything truly novel is invented only during one’s youth. Later, one becomes more experienced, more famous – and more blockheaded“.
Einstein’s frustration at his diminished capabilities as he aged is a phenomenon that is considered common with mathematicians and physicists who seem to make their greatest contributions to science before they turn 40. Einstein remarked to a colleague that as he got older he felt his intellect slowly becoming crippled and calcified.
Why does this happen? In Einstein’s case, it was partly because his early successes had come from his rebellious traits. In his youth, there was a link between his creativity and his willingness to defy authority and the universally accepted cosmological laws of his day. He had no sentimental attachment to the old order and was energized at the chance to show that the accepted knowledge was wrong or incomplete. His stubbornness worked to his advantage.
After he turned 40, his youthful rebellious attitudes were softened by the comforts of fame, renown, riches and a comfortable home. He became wedded to the faith of preserving the certainties and determinism of classical science – leading him to reject the uncertainties inherent in the next great scientific breakthrough, quantum mechanics. His stubbornness began working to his disadvantage as he got older.
It was a fate that Einstein began fearing years before it happened. He wrote after finishing his most groundbreaking papers: “Soon I will reach the age of stagnation and sterility when one laments the revolutionary spirit of the young“. In one of his most revealing statements about himself, Einstein complained: “To punish me for my contempt of authority, Fate has made me an authority myself“. He found it even harder as he got older acknowledging “the increasing difficulty a man past fifty always has adapting to new thoughts”.
Einstein brilliance is beyond compare, but I can relate to his observation about doing your best work when you are young. When I look back at my personal life and work career, I recognize that I was at my most ambitious and innovative during the decades of my 20’s and 30’s.
My adult life exploded with big events in 1982, the year that I turned 22. In the timespan of that one year I managed to graduate from college, marry my college sweetheart, start my first professional job as an engineer, buy a new house and a new car, and learn that my wife and I were going to become first-time parents. I remember filling out a survey designed to measure the amount of stress in your life during that eventful year and being surprised when the calculated stress numbers registered so high that they indicated I should be dead!
But all of it was exhilarating to me at that point in my life. I was experiencing new things and accumulating knowledge like a sponge. I knew that my growing family would be counting on me to be a good provider – which gave me the incentive I needed to focus on building a stable career.
I was determined to be successful in my engineering role and threw myself into learning everything I possibly could about the company I worked for as well as the electronic test and measurement equipment that they manufactured.
Many of my co-workers had graduated from more prestigious universities than me and I felt that I had something to prove. I wanted to make a name for myself and grow my reputation and value within the company by making important contributions to the projects to which I was assigned.
I took several continuing education engineering classes at night to improve my knowledge of subject areas that I knew would be helpful to me at work, I sought out brilliant co-workers who could mentor me and give me wise advice on how to approach complex technical projects, and I questioned everything – wondering if there might be a better solution to the problems we were trying to solve.
This drive in my early career to be successful enabled me to do my most innovative and important work for the company during the decades of my 20’s and 30’s. In the span of my first 18 years working for the company, I was awarded two patents, helped develop multiple new test products which generated millions of dollars for the company, created automated software regression tests significantly lowering product development times while improving software quality, and published frequent technical articles for industry conferences and trade journals.
By the time I turned 40, I could point to many important career milestones and had achieved recognition as a top performer and leader within the company. The rewards of my hard work were a comfortable home and financial independence. With this success I began to have feelings of contentment that lessened my drive to take on new projects or solve interesting problems. I became comfortable and happy with life as it was – I no longer felt the need to over-extend myself.
I was satisfied to rest on my past achievements and to take on less tasking roles that would improve the product in evolutionary, rather than revolutionary ways. Over time, I became the wise, experienced, older mentor to younger employees who came to me for advice and direction.
I felt okay with that transition as I considered it my good fortune to be in a situation where I was able to share my knowledge with a new generation of ambitious young people who were ready to make their own marks on the world by inventing novel new solutions that were now beyond me. In some ways, being a part of those collaborative efforts made me feel better than my individual personal accomplishments.
The famous journalist Ed Bradley once interviewed Bob Dylan in 1998 on the television show 60 minutes, at a time when he was approaching 60 years old. During the course of the interview, Bradley asked Bob what the source of inspiration was for his famous early songs, the ones that led to him being recognized as the voice of a generation while he was still only in his 20’s.
Dylan replied that his early songs were almost magically written and that he felt some kind of power, outside of himself, flowing through him while was writing them. When Bradley asked if he could still tap into that penetrating magic now in his songwriting, Dylan paused and said; “No, I don’t know how I got to write those songs“. Bradley followed up and asked if that disappointed him, Dylan replied softly; “Well you can’t do something forever and I did it once… and I can do other things now – but I can’t do that“.
That is a healthy way, I believe, of thinking about what is possible for each of us as we age. My days of endless ambition and innovative thinking are past. But I can do other things now that I couldn’t do then. I can indulge hobbies that interest me, I can find new paths to hike and rivers to fish, I can help care for my mother in her old age and I can share what I have learned through my life experiences and pass it on to my grandchildren and the larger community via this blog.
There will only ever be one Einstein, none of us will ever be as brilliant as him – but if you are under 40, get busy by putting your spry young mind and youthful ambition to work! Maybe you too can come up with novel ideas and ways of doing things that will help change the world or someone’s life for the better.
And if you are over 40, you can be like Einstein in his older years; contributing in a positive way to his community and sharing his wisdom, experience and good fortune with the next generation. In the end, many of our late in life pursuits that we share with others can end up being more rewarding and meaningful to us than any personal accomplishments we achieve along the way.
“Everybody has a little bit of the sun and moon in them… Everyone is part of a connected cosmic system. Part earth and sea, wind and fire, with some salt and dust swimming in them”
Suzy Kassem
Mankind has always possessed a deep curiosity about the ultimate existential questions of life: how is it that the world came to be and what forces in it led to my creation? Our ancestors, lacking scientific knowledge, made up supernatural creation stories to help them answer these questions and to explain the natural world that their limited human senses observed all around them.
Those of us living today are fortunate because we are on the threshold of becoming the 1st generation to ever know in great detail, and with some confidence, the answers to those great questions. In the past decade the results of several major observational studies have brought a level of clarity and coherence to our understanding of the universe that we have never had before.
The pace of recent cosmological discoveries has been truly breathtaking; especially considering that it was less than 500 years ago when man first learned that the earth revolved around the sun and less than 100 years ago when astronomer Edwin Hubble proved that the universe actually contained more than 1 galaxy.
Thanks to images taken by the Hubble Telescope over the last 30 years; and the first astonishing images produced by the recently launched James Webb Telescope – which sits a million miles away in space – astronomers now have the capability of looking back to the beginning of time – to see the actual birth of galaxies.
The Webb Telescope is 100 times more powerful than the Hubble, with six times more light collecting capability, enabling it to see objects in much finer detail. The increased clarity of the new images have led astronomers to increase their estimates of the number of galaxies in our universe from 200 billion to 2 trillion!
James Webb photo of galactic cluster SMACS 0723, the deepest infrared image of the distant Universe ever produced. The image covers a patch of sky approximately the size of a grain of sand held at arm’s length by someone on the ground. It reveals thousands of galaxies, some of which are as far away as 13.1 billion light years. The bluer galaxies are more mature ones, containing many stars and little dust. The redder galaxies contain more dust, from which stars are still forming. Courtesy of NASA.
What really sets the Webb Telescope apart is its ability to focus on the infrared portion of the light spectrum. Most telescopes are designed to see only the small sliver of visible light emitted by stars. The problem with the visible light spectrum is that it gets blocked by the abundant amount of dust and gas that is floating around the universe.
Infrared light is invisible to the human eye but makes up much of the light that comes our way from the universe. The infrared spectrum of light can see past all that dust and gas, which allows astronomers to look with unprecedented detail at some of the earliest and faintest celestial objects in the universe, ones that were born over 13 billion years ago.
Another incredible capability of the space telescope is its ability to detect exoplanets. An exoplanet is simply a planet that orbits a star outside our solar system. Exoplanets have been historically difficult to find because they are very far away, do not emit any light, and are typically much smaller than the stars they orbit.
But astronomers have discovered innovative indirect methods to detect these exoplanets by measuring the dimming of the light of a star that occurs as a planet passes in front of it or by monitoring the spectrum of a star for the tell-tale signs of a planet’s gravity pulling on it and causing its light to subtly Doppler shift.
Using these planet detection methods, astronomers have estimated that about 1 in 5 “sun-like” stars in the Milky Way Galaxy have an earth-sized planet located within its habitable zone. This would calculate to more than 11 billion potentially habitable Earth-sized planets in our own galaxy to discover!
Incredible as it may seem, Astronomers can detect not only the presence of an exoplanet, they can also employ powerful scientific instruments on the telescope, called spectrographs, to identify the unique signatures of specific molecules in their atmosphere.
When an exoplanet passes in front of its host star, a small fraction of the stellar light passes through the exoplanetary atmosphere, where different molecules absorb light of some wavelengths while light of other wavelengths can pass through unhindered. By measuring the fraction of stellar light able to penetrate the atmosphere at different wavelengths, the chemical composition of the atmosphere can be determined.
Turning the intensity of light measured at different wavelengths into graphical signatures allows scientists to measure the chemistry in the atmosphere of distant planets and detect the presence of water or methane molecules which, if found, could provide evidence that there is – or once was – life on the planet.
I had a passing interest in star gazing when I was a boy. I would set up my cheap telescope in my back yard and focus on different celestial objects, not really knowing what I was looking at. My interest in astronomy faded over time as I became busy with the business of life. After my retirement, however, I decided to pick up my old hobby by signing up for one of the science classes produced by the Great Courses called Cosmology: The History and Nature of our Universe. The course re-kindled my interest in the cosmos and stoked my imagination about the wonders of the universe.
Here are just a few of the the things the course covered that seem incredible to me and filled me with wonder:
We can travel back in time…
Even though Albert Einstein’s theory of relativity tells us that nothing can travel faster than the speed of light, the universe is so vast it still takes light from distant galaxies a long time to reach the earth. By observing light that originated far away we are travelling back in time to see how the Universe looked when it was younger (we can’t know for sure what distant objects in the universe look like today because their light is not yet observable to us).
Light travels at a speed of 186,282 miles per second, which equates to 5.88 trillion miles per year – which scientists define as the distance light travels in 1 light year. Light from any celestial object that is more than 5.88 trillion miles away from the earth takes more than 1 earth year to reach us. Earth’s average distance from our sun is 93 million miles, so its light only takes about 8.3 minutes to reach us.
The telescopes we have today are powerful enough to observe the first light that came from the hot glowing gas of the Big Bang itself, that moment in time approximately 14 billion years ago, when astronomers believe that our universe came into being.
The brilliant light from this hot gas is observable to scientists via what is called the cosmic microwave background and it shows astronomers a view of the Universe approximately 400,000 years after the Big Bang. Immediately after the Big Bang, the Universe was so hot that the gas was foggy and impenetrable, but as time passed expansion cooled the Universe, and after 400,000 years the temperature dropped enough for the fog to clear and for atoms to form.
So, looking outward (and back in time), our vision is limited by this bright, glowing wall of fog. As the light crosses the expanding Universe, its waves are stretched 1000-fold and arrive as microwaves. So the microwave background reveals the universe in its “pre-embryonic” state right after the Big Bang!
The Laws of the Universe are constant…
Einstein once famously said “The most incomprehensible thing about the Universe is that it is comprehensible.” How is it possible that humans could have developed the mental capacity to understand such a vast and utterly remote cosmic realm? How can something that emerged out of the atoms and evolutionary forces of Nature come to comprehend itself?
The answer is that we all are, in a sense, children of Nature. Much of the character of the universe is all around us here on earth. We’ve evolved in an astronomical setting that is itself beholden to the same laws of physics that span all of space and time. The laws of physics are the same everywhere, and there is much that is cosmic even here on Earth. For example, humans have evolved within Newtonian space and time, which is identical to 99% of cosmic space and time, and this has resulted in our ability to comprehend things like location, distance, size, light and speed.
As far as we know all objects in the universe obey the same universal laws of nature (gravity, motion, thermodynamics, electricity, energy). Because we have studied these topics here on earth for centuries, we can apply our understanding of these laws to everything we observe in the universe.
The nature of matter is constant…
Not only are the laws of physics the same throughout the universe, so is the nature of matter. As far as we know the atomic elements that make up all the matter on earth exists everywhere throughout the universe.
Us, and everything around us, are made of atoms. Atoms are incredibly tiny and numerous. There are about 100 kinds of atoms that we have discovered, each making a particular chemical element, such as hydrogen, carbon, gold, or uranium. The elements are ordered in a periodic table so that elements with similar chemical properties line up in columns.
The Thermonuclear fusion occurring inside stars causes them to become “atom factories.” The huge weight of a star makes a hot, dense core like a furnace: The star burns lightweight fuels into heavier ones. This fusion burning releases energy, which heats the core further and keeps the reactions going. Heat also moves up to the surface, which glows brightly. In the core, the ash from one reaction becomes the fuel for another.
For example, hydrogen burns to helium, which then burns to carbon, and so on. Reactions further down the sequence need ever-higher temperature, because nuclei with more protons repel more strongly. Ultimately, how far along this sequence a star gets depends on its mass; stars of higher mass can make heavier elements.
How do these freshly made nuclei get out of the star’s core and into the matter that makes up our universe? The remarkable journey starts when the nuclei are brought to the surface in huge, hot currents of gas. On their way up, at lower temperature, the nuclei acquire their quota of electrons and become atoms. These atoms are finally ejected into space when the fuel runs out, the nuclear reactions cease and the star dies.
We are made of star stuff…
When the astronomer Carl Sagan said his famous line that each of us are made of star stuff, he was reminding people that much of the matter of our bodies was created within the stars long ago. He wanted people to know we are marvelous and our story is, too.
Modern cosmology doesn’t just deal with huge things like stars and galaxies; it must also consider the creation of atoms and the planets and people that atoms make. It is a story that takes us from the hearts of atoms to the hearts of stars, and out into the galaxy to watch the birth and death of stars and planets.
It is complemented by the the billion-year mechanism that slowly coaxes these tiny atoms into assembling plants and animals and people – and even the brain reading this sentence. We are no less a part of the Universe than any star or galaxy.
The atoms in you and me probably drifted around in the interstellar medium for 1 or 2 billion years before joining a denser cloud. Within such clouds, small pockets collapse to form stars, and around these stars, disks of dust and gas, which in turn form planets.
In the case of the Earth, some atoms ended up in a spherical ball, with a barren, cratered surface heaving with volcanism. During the next 4.5 billion years, an extraordinary transformation took place, enabled by atoms’ amazing ability to stick together and form molecules which can combine in complex ways.
It’s easy to feel small and insignificant when you consider the vastness of the universe and the timescale of celestial events, especially in comparison with our meager human lifespan. We become awestruck while looking at telescopic images and realizing that a single picture representing one minuscule sliver of the universe is filled with thousands of galaxies, each with billions or trillions of star systems and each of those with its own planets.
Deep field images like those produced by the Webb telescope show us spectacular moments frozen in time. We can see galaxies wrap around one another, colliding and tearing their dusty, star-riddled arms apart in a violent ballet. It’s no wonder that people all over the world stare in wonder at the majesty of it all.
Space exploration is one of the few things that our divided society can agree is overwhelmingly positive. It reminds us of our inherent connection with the universe, but it can also lead to feelings of a profound sense of insignificance – showing us, on a grand scale, just how small we are.
However, despite the vastness of the Universe and our small place in it, we should not feel insignificant. A diagram plotting mass versus complexity would show that living things are enormously more complex than astronomical objects. If objects shone with a brightness in proportion to their complexity, then galaxies would be dim light bulbs, while our brain alone would be a beacon of light visible across the whole Universe!
When you think about it that way, we are very special – and we should be grateful to the stars above that we are one of the most complex things the universe has ever made!
Time is a familiar but mysterious concept. We think about and use it every day, yet it is difficult to describe what it actually is. Saint Augustine puzzled about time when he wrote, “What is time? If no one asks me, I know. But if I wish to explain it to someone who asks, I know not.”
Poets and philosophers throughout the ages have eloquently tried to capture how their senses perceive Time by using phrases such as; “Time is fleeting“, “Time waits for no man“, “Time heals all wounds” and “Time stands still“. None of these phrases, however, succeed in advancing a deeper understanding of the mystery that is Time.
My background in engineering led me to wonder about the concept of Time beyond the typical artistic and philosophical musings – to explore what science actually had to say about the mysterious subject. So, with curiosity and time on my hands, my search led me to an online course called the Physics of Time. In this month’s blog I will share some of the interesting insights I learned about Time from that course.
Time can be examined from two separate scientific perspectives. The first is a biological perspective which deals with internal human body clocks and how the brain processes and perceives time. The second is an external cosmological perspective which has to do with the origin and evolution of time in the known universe.
Human bodies and brains have a natural way to recognize the passing of time because we have predictable biological clocks – like breathing and the beating of our hearts – that exist within each of us .
With a heart rate of about 60 beats per minute and a lifespan of roughly 70 years, the human heart will beat approximately 2 billion times. Chickens have a much faster heart rate of about 275 beats per minute, and live only 15 years – but their hearts, in the end, will also have 2 billion lifetime heartbeats.
Science has observed that the hearts of most animals will beat somewhere between 1-2 billion times but there is an inverse relationship between heart rate and lifespan. In general, the faster the heart rate, the shorter the life span. I wonder if those animals who live fast and die young perceive time any differently than us longer life-span creatures.
Besides the heart and the breath, Neuroscientists have identified three kinds of timekeeping devices inside our brains. One part of the brain keeps track of what time of day it is, another part keeps track of how much time has passed while doing certain tasks and still other parts of the brain serve as alarm clocks for events set to happen in the future.
Different neuron pulses working together in the brain help us to perceive the passage of time. These pulses can be affected by stimulants, such as caffeine, and depressants, such as alcohol which interfere with neurotransmitters in ways that make our internal clocks speed up or slow down.
We experience other biological processes that don’t repeat themselves but still contribute to our awareness of time passing: We age; we think; we make choices; we plan for the future; we remember the past. All these different aspects of time are crucial to what it means to live our lives and be human beings. Perhaps the most important aspect of our awareness of the passage of time is the accumulation of experiences.
People have observed that when they are focused on a task, they don’t pay as much attention to the outside world or to their internal clock. This causes their internal timekeeping devices to slow down while the outside world speeds up. For example, I am surprised how quickly the hours elapse while I am engrossed watching my favorite sports teams compete in a big game.
In contrast, when we are bored and not focused on any one task, the opposite effect happens. Our internal clock seems to go faster while the outside world seems to slow down. For example, when I am stuck on an airplane with nothing to do, the plane trip seems to last forever.
Scientist have reported that subjects in high-stress experiments recollect that time slowed down for them during stressful events. One theory behind this phenomenon is that the more memories we accumulate, the more time we think has passed. Our brains, when we are in a high-stress situation, does its best to record absolutely everything. It accumulates a huge amount of data, so when you think about the situation afterward, you have more memories to leaf through—and, therefore, it seems as if more time has passed.
This theory gets support from the fact that time seems to pass more quickly as we age. Summer seemed to last forever when we were children, but it seems to rush by as we get older. It may be that when we were young in the summertime, such activities as going to the beach were new to us, but as we get older we experience fewer interesting new things. Our brains don’t take in as much new information and we create fewer memories than a child would; thus, time seems to pass more quickly for us compared to when we were a child.
To understand Time from a cosmological perspective is difficult because it requires the human mind to reckon with complex physical laws of the universe that were set in place at the beginning of the universe – and to consider hard to grasp time spans that are billions of years in length.
Most physicists believe Time began approximately 13.8 billion years ago with a singular event known as the Big Bang – the so called “birth” of the universe – a point where space underwent rapid expansion and the laws of physics as we understand them came into being. The Earth is about 4.5 billion years old, so it is a substantial fraction of the age of the universe.
At the beginning, all matter in the universe was densely packed and its temperature was extremely high. About 380,000 years after the Big Bang, the universe cooled sufficiently to allow the formation of subatomic particles and simple atoms. Giant clouds of these primordial elements later coalesced through gravity into matter, eventually forming early stars, galaxies and the other astronomical structures that are observable today.
The feature of matter that is inextricably linked with time is called entropy. Entropy is a way of talking about the disorderliness of “stuff” in the universe. It is the natural tendency of things to lose order over time. For example, a whole egg is very orderly, but if we break the egg, it becomes disorderly; if we scramble the egg, it becomes even more disorderly. A scientist would say that the egg moves from a low entropy state to a high entropy state.
In the long run, nothing escapes the Second Law of Thermodynamics
Entropy is the only quantity in the physical sciences that seems to imply a particular direction of progress, sometimes called an arrow of time. As time progresses, the second law of thermodynamics states that the entropy of an isolated system never decreases over significant periods of time. Entropy measurement can be thought of as a clock and things only happen in one direction of time – not the other. The past is always defined to be the direction in which entropy was lower.
The pull of entropy on matter is relentless. Everything decays. Disorder always increases. The increasing entropy of our universe over time underlies all the ways in which the past is different from the future.
It is the reason why you can disperse the scent of perfume from a bottle into a room, but cannot put the scent back into the bottle; the reason why you can mix cream into your coffee, but cannot un-mix it; the reason why cars eventually break down; the reason you remember the past and not the future; the reason you are born young and grow older; the reason you can make a choice about what to have for dinner tomorrow, but not about what to have for dinner yesterday.
When energy is in a low-entropy form, it can do useful work. When energy is converted into a high-entropy form, it becomes useless. We have fossil fuels sitting in the ground with energy in them in a concentrated form. We can extract the energy to do useful work because the entropy of the fuel is low. Once the fuel is burned it is converted to its high entropy form and it can no longer perform useful work. You can heat a room in your house by burning coal, but you cannot cool off a room in your house by unburning fuel and turning it into coal.
The common thread in these examples is irreversibility: Something happens in one direction, and it is easy to make it happen, but it does not happen in the other direction, or if it does, it is because we put effort into it. It does not spontaneously happen. Things go in one direction of time. They do not go back all by themselves.
It’s not time itself that treats the past, present, and future differently; it’s the arrow of time, which is ultimately dependent on all the “stuff” we have in the universe. It is the arrow of time that gives us the impression that time passes, that we progress through different moments. It’s not that the past is more real than the future; it’s that we know more about the past. We have different access to it than we have to the future.
Stephen Hawking combined the biological and cosmological elements of time into three distinct “arrow of time” components. First, there is the thermodynamic arrow of time—the direction of time in which disorder or entropy increases. Second, there is the psychological arrow of time. This is the direction in which we feel time passes—the direction of time in which we remember the past, but not the future. Third, there is the cosmological arrow of time. This is the direction of time in which the universe is expanding rather than contracting.
At the moment of the Big Bang our universe was in a condition of very low entropy and very high organization. That’s what got time started in the way we experience it in our everyday lives. Ever since the Big Bang, we’ve been living out the process by which the universe increases in entropy. That’s the influential event in the aftermath of which all humans live.
At this point in time the universe is in a condition of medium entropy. It is today that we have galaxies and stars and planets and life on those planets. Complexity depends on entropy; it relies on the fact that entropy is increasing. We don’t have to worry about how complexity can arise in a universe that is evolving. The simple fact that entropy is increasing is what makes life possible.
Scientists have confirmed that the universe continues to expand. Distant galaxies are moving away from us, and the farther away they are, the faster they are receding. The amount of space between us and the other galaxies is increasing.
The second law of thermodynamics predicts that the total entropy of the universe will continue to increase until it reaches equilibrium. The universe will calm down and become colder and colder. Everything will scatter to the winds, evolution will stop and we will have empty space once again. It is speculated by some that after a googol (1 x 10 to the 100th power) years from now, our universe will be empty space and that empty space will last forever.
There are some however who believe instead that multiple universes exist. According to this idea, the Big Bang was an event that is quite small in the history of a much larger multiverse. We see only a finite bit of the universe; perhaps farther away than what we can see, the universe looks very different. The fact that our own universe is inflating gives some credibility to this idea.
Those who talk about the possibility of a multiverse are simply observing that there is a barrier in our universe’s past beyond which we cannot see. Is there a finite amount of stuff out there? Is there an infinite amount of stuff that works exactly like the stuff we can see? Or is there an infinite amount of stuff and conditions that are very different from place to place? Until scientists can answer these questions, they can only speculate.
Regardless of which theory you believe about how the universe will ultimately evolve, we can say that all scientists agree that the universe is a complicated system, embedded in an environment that is far from equilibrium and that there is something called entropy that characterizes the organization or disorganization of us and our environment and results in the evolution of matter.
No discussion of Time would be complete without mentioning one of the most important contributions ever made to science – Albert Einstein’s 1905 publishing of the Theory of Special Relativity. Before Einstein, physicists thought of time as simple and absolute, a steady linear flow separate from the three dimensions of space.
Einstein showed that time is not simple and absolute but is actually influenced by speed and gravity. He stated that there is a link between motion in space and the passage of time. Space and time are fused together in what Einstein called 4 dimensional space-time.
Einstein theorized that Time runs more slowly for an object if it is in motion. Scientists proved this by synchronizing two atomic clocks and placing one clock in a stationary location and the other clock on a plane that was flown around the world. Upon landing, the clocks were no longer synchronized, the one that had been on the plane was milliseconds behind the one that was stationary – indicating less time had elapsed for the moving clock.
With Einstein’s relativity discovery, there is no such thing as one moment of time throughout the universe that everyone agrees on. Space and time are not absolute; they are relative – which means what we call time can be different for different observers.
How much time passes for an object depends on how you move through the universe. The network of satellites in space that carry precision atomic clocks for the global positioning system must be constantly compensated because they “lose” seven microseconds per day compared to ground clocks that are operating in a “slower time stream”.
The faster something moves, the “slower” it ages. Physicists call this effect time dilation. Theoretically, under its influence, a space voyager could return to Earth after a 20-year voyage to find himself hundreds of years in the future. To carry time dilation to its absolute extreme—as we approach travel at the speed of light, it is possible that time stops and immortality begins.
Space-time, Einstein’s four-dimensional reality of our universe, is a collection of an infinite number of events, just as space is a collection of an infinite number of points indexed by the three dimensions of space. Just as we think of all space as being “out there”, Einstein said we should think of all time as also being out there: “The difference between Past, Present, and Future is only an illusion, however persistent“.
I must admit that my deep dive into the science of time raised as many questions as it answered – but that doesn’t mean my study was a waste of my time. On the contrary, I gained some wisdom about life and walk away with a list of important things to remember that will help me make the most of whatever time I have left.
Remember that we are very, very small – Mankind is like a grain of sand in the vast Sahara Desert, occupying an infinitesimally small place in the universe. The astronomer Carl Sagan said that earth is nothing more than “a mote of dust suspended in a sunbeam and our time amounts to nothing more than a blip“. Compared to the enormity of the cosmos and the eternity of time, it is wise for us to keep an attitude of humility, remembering the short duration of our life and the insignificance of our daily struggles.
Be grateful we are alive – In a world full of matter, humans have been fortunate to form over time into a remarkable collection of atoms that are alive, conscious and capable of love and memory. As far as we know, we are the most advanced form of life in the wide universe. In his book Cat’s Cradle, Kurt Vonnegut expresses wonder and gratitude for the gift it was to have become what he called some of the “sitting up” kind of mud in the universe.
“God made mud. God got lonesome. So God said to some of the mud, “Sit up!” “See all I’ve made,” said God, “the hills, the sea, the sky, the stars.” And I was some of the mud that got to sit up and look around. Lucky me, lucky mud. I, mud, sat up and saw what a nice job God had done. Nice going, God. Nobody but you could have done it, God! I certainly couldn’t have. I feel very unimportant compared to You. The only way I can feel the least bit important is to think of all the mud that didn’t even get to sit up and look around. I got so much, and most mud got so little. Thank you for the honor! Now mud lies down again and goes to sleep. What memories for mud to have! What interesting other kinds of sitting-up mud I met! I loved everything I saw! Good night. I will go to heaven now. I can hardly wait… Amen
Kurt Vonnegut “Cat’s Cradle”
Embrace change – Entropy is a natural law, we can’t repeal it or wish it away. Entropy is what helps us to evolve and it is what makes life complex and interesting. So, rather than fight change – which is inevitable – it is healthier for us to embrace the change in our life and determine how we can best use it to evolve in ways that make us better.
Be Mindful of the Present – Sometimes it can be impossible to focus entirely on the present because it comes with an echo of the past and a foretaste of the future. Our minds typically refuse to stay in the present, constantly regretting a past that can never be undone or anxiously awaiting a future that may never arrive. The mind can be trained with Mindful Meditation techniques that teach us how to live “outside of time”, focusing our attention on each passing moment, slowing our perception of time and relieving us of our anxiety over past and future events.
Get busy and try something new – Time moves more slowly for a body in motion and we perceive the passage of time as moving slower during those moments when we are creating new memories. That tells me if I want to make the most out of time I should be pursuing activities that keep me moving and learning new things.
Don’t rule out the Divine – There is agreement among scientists that the universe started in a dense state of very low entropy and that it is expanding over time towards higher entropy. The questions that still puzzle scientists however is what triggered the Big Bang event and why did the universe start in such an unlikely state of low entropy? As a man of science and a man of God, I am somehow comforted when all questions cannot be answered and there is room in the discussions for us to ponder the possibility of a divine hand in the origin of the universe.
May you enjoy your own personal time travel trip – here’s hoping that you live every moment and love every day before your precious time slips away.
Words to Live By... 