You’ve heard it before: ‘anything is possible.’ I have also, but how much truth is there in this statement? On the surface it sounds OK; it’s usually used in a positive tone (but not always) and it’s open to seemingly unlimited possibilities. What could be wrong with that? Hold on just a minute until we look a little deeper.
Is anything really possible? And can we determine when something becomes impossible? If a person losses a hand, it won’t grow back. A conventional air plane will not fly without wings. Pure water will not freeze if the temperature is above 0 degrees Celsius. So there you have it, anything is not possible. I don’t think this is a big revelation. People who say that ‘anything is possible’ know that it isn’t true. So why do they say it? We all go through life with insufficient knowledge, it’s just part of being human. I believe what people are really thinking is: many things are possible, or they don’t know what’s possible.
‘I don’t know what’s possible’ doesn’t sound quite as positive as ‘anything is possible.’ So maybe that’s why the word anything is so often used. Despite our limited knowledge, there lies one fundamental truth which determines what is possible and what isn’t. This truth is related to the following question: What does the loss of a hand, an airplane not being able to fly and water not freezing have in common? On the surface they seem totally unrelated; however, they share a subtle and profound relationship. I’ll get back to this later but first a little back ground.
There are reasons why some things are possible and others impossible and they are fundamentally the same reasons. It has to do with the way the world works (in fact the entire universe). There exist regularities in nature, both seen and unseen. Some of these regularities would have been known in ancient times simply by observing nature. For example, the ancients were aware of the conditions needed to make fire and how to put it out. They learned how to grow food by observing how crops responded to the seasons and so on. Early humans had a rudimentary understanding of what might be possible. They achieved this with varying degrees of success by observing nature’s regularities. However, they lacked an appreciation of what was behind the observed regularities. A deeper understanding would come about later.
The Scientific Revolution of the 15th and 16th hundreds is the unofficial line of demarcation of modern science. This is when scientists began deciphering the laws that govern nature. The laws of nature are fundamental to the regularities we observe. For the first time nature could be explained by a series of scientific laws rather than superstition, conjecture or a few rules of thumb. For instance, seen phenomena such as the motion of objects were explained by Newton’s laws of motion. Perhaps even more ground breaking is that eventually parts of the unseen world could also be explained by scientific laws. For Example, quantum laws of the early 19th hundreds, of which several scientists were involved, explained the workings of atomic and sub-atomic particles.
Out of the Ordinary
In everyday experience people often use the ‘anything is possible’ line as a positive projection into the future. They are usually thinking about the trajectory of one’s life and the numerous untapped possibilities. In this context they are referring to ordinary events in human affairs. Ordinary in the sense that one doesn’t had to believe in anything outside the established laws of nature to account for what might unfold.
Some people consider other ideas, which fall into a totally different category. These ideas are sometimes called paranormal or supernatural, but personally I dislike both those terms. The reason being, that some of these concepts diminish the established laws of nature. The simplest way I can convey what kind of ideas I mean is to begin with a list. The following is just from the top of my head and much more could apply: alien visitations, ghost stories, miraculous healings, near-death experiences, psychic readings and so on. With this list, one should ask: how do the laws of nature fit in these schemes?
Let’s look into one of the possibilities listed above. With alien visitations for instance, one has to consider such things as a life-sustaining planet and the distance the aliens would have to travel. A little understanding of the laws of nature can give us clues as to how seriously we should consider a claim. We know that other than Earth, there is no complex life in our Solar System. So our star system is out.
The nearest star system is a three star system call Alpha Centauri, of which Proxima is the closest (about 4.24 light years away). On the surface this doesn’t sound all that far away. However, if we consider present technologies, it would take anywhere from 19,000 to 76,000 years to make the trip. The wide range in estimates has to do with which technologies would ultimately prove viable for such a trip. We should also consider the possibility that the proposed aliens would have to come from much farther away.
In short, in an absolute best case scenario, there would have to exist a life-sustaining planet where intelligent life evolved and its inhabitants developed far superior technology. Not an impossibility, but a long shot. The determining factor is the limits imposed by the laws of physics. The limits in this case are distance and how fast a spaceship can travel. Keep in mind that no matter how advanced a technology may be it cannot overcome the laws of physics. Considering the distances involved, it seems unlikely that we have been visited by aliens.
Pure and Simple
Now back to my earlier question: about the loss of a hand, an airplane unable to fly and water not freezing. All three are determined by the laws of nature; specifically, the limits of biology, physics and chemistry. And that’s not only true for these three scenarios but for any proposed idea. That’s right, any proposed idea. That being said, it needs to be mentioned that our understanding of the laws of nature are likely incomplete and currently serve as our best representation of reality. Nevertheless, whether we are talking about everyday experience or the fantastic, the laws of nature run the show. Whether the answer lies within the scope of our knowledge or not; it all boils down to one simple truth: anything which is in principle allowed by the laws of nature is possible and anything which is not allowed by the laws of nature is impossible!
References: Universe Today, How Long Would it Take to Travel to the Nearest Star?, Sept 6, 2016 by Matt Williams. http://www.universetoday.com/15403/how-long-would-it-take-to-travel-to-the-nearest-star/