Due to the relative brevity of our existence, human beings often find it difficult to comprehend spans of time as implausibly long as those which apply to the formation of the universe, our planet and indeed, our species. In order to understand time from the point of view of the universe we need to shake off the frames of reference which we ordinarily use to comprehend its passage.
Imagine the course of a modern marathon. However, instead of the grey roads and pathways which one would usually associate with the event, this marathon will be run over a timeline of the universe, with the big bang at the start line and the present day right at the finish. Over the course of the 42.125 kilometre race every three kilometres completed equates to the passage of one billion years on the universe's time line. As time and distance progress, the timeline will illustrate the changes taking place in the structure of our universe, our galaxy and our planet.

And so the starter's flag falls. After covering the imperceptibly tiny distance of just a few femtometres, our athletes have already passed some of the most significant events in our universe's history. The big bang itself was quickly followed by the formation of the first basic elements: mostly hydrogen and helium gas, as well as a tiny amount of lithium. These developments were seen inside the first three seconds of our universe's existence, so there's still 13.7 billion years of timeline to come, covering the remaining 42 and a bit kilometres of our cosmic marathon. Once they have completed a kilometre or so, our athletes will be around 300 million years into the universe's lifetime. By now they may be sweating a bit, and that seems appropriate, because appearing on the timeline are the first stars and galaxies. Within these vast celestial furnaces, nuclear fusion occurred. Through this process, the simple elements began to synthesize, and new elements were formed. After burning in the void of space for billions of years these first stars eventually reach the end of their life cycle and die, resulting in enormous explosions called supernovae. It is within the debris of these explosions that the products of nuclear fusion are found: the heavy elements. This debris was hurled into the surrounding space, burning and fizzing as it progressed into the darkness, where it would eventually become the building blocks to a great many things, such as your skeleton.

Gravity is the weakest of the four forces of the universe, but it has had a profound effect on its formation due to its ability to act over enormous distances, as described by Newton's inverse square law. Drawn together by their mutual gravitational attraction, the clumps of elements which burst forth from their fiery birth were brought together to form even greater clumps. It is by this slow process of accretion that the planets were formed. By now our athletes are around 27 kilometres into the race. Beneath their feet are many tiny specks, dwarfed to the point of absurdity by their neighbouring stars: the first planets. One such planet, orbiting a relatively small star somewhere in the Orion-Cygnus arm of the Milky way, is earth. However, at this point, 9.5 billion years after the big bang, its is unlikely that it would be easily recognised. Rather than the familiar blue and green orb we see in photos like those taken by Apollo 17 on its way to the moon, the early Earth would have appeared more like a burning ball of fire and magma, dancing through space to the tune of angular momentum. A day on Earth during the Hadean period (the period was named after Hades, the ancient Greek underworld, due to its ferocious temperatures and molten conditions) was far shorter than it is now, perhaps as brief as four hours, because the planet was spinning much more quickly. Of course, there was nothing on the planet that could witness this.

Our athletes are now almost 30 kilometres through their race, and over 10 billion years of the universe's timeline is behind them. Our planet has now cooled significantly, and a rise in pH towards a more neutral value has also occurred. Due to its position within its solar system, not too close to its star, but also not too distant, a particular chemical substance can exist on the surface of Earth in a liquid form: dihydrogen monoxide, more commonly referred to as water. Within the vastitude of the universe, the presence or absence of a particular chemical substance in a liquid phase on the surface of a planet in a far flung solar system appears to be a fact of preposterous insignificance. However, when it occurs alongside a number of other conditions, the presence of liquid water can be the catalyst for a process which is, among all the billions that occur in our universe, one of the most extraordinary: the organisation of inanimate matter into animate entities, the emergence of life.
Although the process by which life came about is not yet known, scientists suspect that in order for it to occur, the existence of six particular elements is required: carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur. These constitute the building blocks of nucleic acids, proteins and lipids, the primary constituents of life. Perhaps there are lifeforms which came to be in an environment devoid of these materials, but in order for life as it appears on earth to exist, they are vital. Whether or not life exists throughout the universe, or only on our planet, is not clear, and indeed, estimating the likelihood of life emerging elsewhere is difficult, given our lack of knowledge regarding the processes associated with its earthly genesis. What we do understand, however, is that once the quantum leap from inanimate to animate occurred, the process of natural selection began. It is an astonishing thought to consider that from those first basic elements, all planets, stars and living things were formed. However the journey, of both life and the universe, is far from at its end.

With about 12 kilometres left in race, a tiny portion of the matter on our planet has made the leap from non-living to living. 10 billions years after the big bang, with the temperatures on the planet's slowly forming land masses still high, it was in the depths of the Earth's great oceans that first life dwelled. Just as the planets and solar systems were derived from the simplicity of hydrogen, all of the complexity and diversity of life on Earth can trace its origins to the most simple form of life: a single cell. Although they lacked the ability to recognise it, a very powerful force was acting upon these first living beings. It was a force which was built into the environment they inhabited as well as the beings themselves. That force is selective pressure. These basic organisms reproduced by a process called binary fission, which involves the replication of the cell's single chromosome, followed by cytokineisis, the splitting of the single cell into two distinct and individual cells. This process is a fundamental part of natural selection. If all of the cells which this reproductive mechanism produced were perfectly identical, none would be better adapted to the environment than any others. However perfection is something which has not yet been encountered in this universe. Mutations occurred during chromosomal replication, resulting in subtle variations in some cells. Some of those variations were of no advantage in, or were possibly even deleterious to, the fight for survival, but some resulted in a slight advantage. A hypothetical example of a beneficial mutation could be a slightly stronger or larger flagellum. The flagellum is a tail like projection which protrudes from a the cell body, and acts as a means of propulsion. A stronger flagellum would render an organism better suited to its aquatic environment than a similar cell which possess a smaller, weaker flagellum, because the former could propel itself towards food sources more quickly, thus improving its chances of procuring the nutrition necessary to ensure its survival. Those cells which possess smaller flagella are less suited to their environment than their better endowed rivals, and therefore their survival is less likely. Without survival future reproduction is not possible, and therefore the gene which results in smaller flagella eventually dies out: it is not selected. Those organisms which possess the genes which code for the advantageous phenotype are more likely to survive and produce progeny, all of whom possess the same advantageous genetic code, and thus it is propagated.

For a long time, the planet's land masses remained a fantastically inhospitable environment due to hurricane winds, high temperatures and the greater proximity of the Moon, which resulted in enormous tides. Also, the ozone layer had not yet formed, meaning that the bleak and empty continents of Earth were constantly barraged by ultraviolet light. In the oceans, however, life was thriving. The ability to derive energy directly from sunlight through the process of photosynthesis became an important survival tool for many organisms. For over 2 billion years, all of the planet's life took the form of various single celled organisms. The eventual emergence of sexual reproduction as a means of passing on genetic information resulted in a greater degree of variation among the population, as genotypes were combined rather than simply replicating. This increase in variation within the population resulted in an enhanced rate of evolution. Soon multi-cellular organisms emerged. However, it would be a billion years, or about three kilometres along the timeline for our athletes, before the first animals emerged. At this point in the race the finish line is in sight, just metres away in fact, and yet human beings are still a very distant prospect. The formation of the ozone layer coincided with widespread emergence of land dwelling organisms. On the land, natural selection continued unabated, driven by competition for nutrition, mates and territory. The enormous variety in the potential methods of garnering the resources required for survival and reproduction resulted in great variation in organisms, as those who possessed traits which were more suited to the exploitation of any means of nutrition than their rivals were naturally selected. The complexity of the environment meant that a wide range of ecological niches were available, so a wide range of adaptions were viable. Diversification increased as species evolved based on the demands of their particular environments. Many species were formed and died out, the journey from extant to extinct occurring in what is nothing more than a couple of centimeters on our timeline. However, one particular group of organisms had a little bit more evolutionary stamina than most. The reign of the dinosaurs lasted 160 million years. With huge variation in body types allowing a wide range of ecological niches, the Earth was the uncontested stomping ground of these beasts until roughly 65 million years ago, when something, perhaps a large meteorite, changed the environment drastically. This meant that the adaptions which they, and many other organisms, possessed were not longer suitable, and so the dinosaurs were selected against. With the elimination of the vast majority of apex predators, other species could now take advantage of the available resources which the dinosaurs had once dominated. The fight to fill the gap in the ecosystem eventually resulted in the emergence of a huge number of new organisms, but it was the mammals, a class of organism which survived the Cretaceous-Tertiary extinction, who came to prominence. The following period saw a huge degree of diversification within the class, but it took over 60 million years for the genus Homo to emerge. Variation within this genus saw species such as the cannibalistic Homo antecessor, the bipedal Homo erectus and Homo ergaster, whose cervical vertebrae seem to indicated that ergaster had the ability to speak in a manner very similar to modern humans. It wasn't until roughly 13,699,800,000 years after the big bang, or less than ten centimeters from the end of our athletes' race, that human beings emerged. Imagine that for one moment next time your see marathon runners trudging along the streets of London or New York on your television screens. If you were to place match box just before the finish line, it would more than equal the proportion of the course which the existence of our species takes up on a universal scale 42.125 kilometres long. The entirety of human history, from the scavengers of the lower Palaeolithic to the skyscrapers and cities of the present day, all of it could be completely subsumed by a single footfall.

The race to today is over, but that only brings us so far. Time's steady advance comes to dwarf all things. Even the mightiest stars are mere flickers when set against the swelling temporal tide. Just like all things, humanity will also yield to time's passage. The difference in our case is that we are conscious entities. While other things merely exist, human beings can learn, think and know. The magnitude of this fact cannot be overstated. Its significance is in every particle, every galaxy and every mind. We are the universe made sentient. Our very thoughts are the thoughts of the cosmos.
A sense of egoism is an expedient attribute from an evolutionary point of view. It would be a decidedly inviable species whose members are not, to a large extent, fundamentally concerned with ensuring that they survive. This survival requires an implicit and yet wholehearted devotion to the task of propagating one's genetic code. While our more advance cognitive abilities have allowed us, as a species, to tame the evolutionarily derived characteristics which we recognise as undesirable in our civilised setting, human beings are still a product of the same process which produced all other organisms, and therefore, we still bear its hallmarks. An evolutionary heritage is one of game theoretical co-operation, as well as vigorous competition. It is one which scarcely had room for a grander perspective, a perspective which could include such things as contemplation and reflection. Survival was our work, our sport, our recreation and our religion. Securing the necessities for survival (and the evolutionary purpose of survival: reproduction) was of absolute importance. Until that had been achieved, all else had to wait. But unlike other species, homo sapiens had the ability to rationalise their position. This allowed us to derive means of survival which didn't require the constant pursuit and struggle of the hunter gatherer. We could settle and stockpile resources. We could also plan our existence in a fashion which allowed us to distance ourselves from direct and bloody competition. As this distance grew, we became alienated from the circular simplicity which was evolutionarily programmed into our former lives: survive to reproduce, reproduce to survive. Our cognitive abilities had allowed our species to reach a position where individual survival was relatively easy to secure. This had the effect of emancipating our minds from purely contemporaneous concerns, allowing the consciousness an unprecedented degree of freedom. We began to explore the mysteries around us. Before long we would have in our hands the strength to move mountains and in our eyes the focus to see the birth of stars. But no matter what heights we scale, we cannot be free from that part of ourselves which still dwells in the world of the struggle, the world of survival. That is why, while our space probes speed to the outer reaches of our galaxy and our very own genome is mapped in its entirety, we continue to kill, steal, rape and destroy.
Violence and corruption are predicates of egoism. For some, the desire to achieve personal power is more important than the rules which allow the peace and stability on which society and progression depend. But we can take a wider perspective, a perspective which encompasses not only our own origin, but that of all which is around us, and its future too. It is a remarkable fact that, over 13,699,800,000 years, the hydrogen and helium of our universe's origin eventually became conscious, and we are that consciousness. Our egoism directs us towards lives which pursue the urges of biology and the pleasures evolution selected to incentivise them, but if we use our intellects we can examine the extraordinary mysteries which surround us, and in doing so, we allow this universe to contemplate itself.
