It is possible to ask many more such questions. Astronomer Neil F. Comins, from Maine University, explained in his book, What If the Moon Didn’t Exist, the scenarios humankind would have faced if the Moon hadn’t existed. According to Comins, one of the millions of reasons why Earth is the only planet (known to us) to have life is the delicate balance between the Earth and the Moon. No occurrence in the universe is a coincidence, thus the Moon has been created as a balance factor. This balance is so sensitive that it is possible to say that there would be no life on Earth if it weren’t for the Moon.

The Moon, a sphere that has no atmosphere, and has a surface covered with craters, dust and rocks, is the Earth’s only satellite. The radius of the Moon is about one fourth of that of the Earth’s, its volume is about 1/50 of the Earth’s, and its mass is about 1/81 of the Earth’s. The Moon is around 240,000 miles from the Earth’s center and it takes 29.5 days to complete its orbit around the Earth. Even though we do not know for sure how the Moon came into being, the currently accepted theory asserts that a planet about 10 times lighter than the Earth, which astronomers call “Thiea,” crashed into Earth and a part of that planet broke apart and fell into space. This part (having lost its shape and most of its mass) crashed into Earth again after orbiting the Earth. In this second crash, the metal center of “Theia” fused into the center of the Earth while the outer shell’s light rocks scattered into space. In time, these little rocks fused to form the Moon. At first, the Moon orbited the Earth with a distance of only 14,000 miles, but in time this distance increased into an average of 240,000 miles.

The Moon’s largest effect on Earth is the tide. According to the law of universal gravitation, any two objects in the universe pull each other, and the force of this pull is in direct proportion to the objects’ masses and in inverse proportion to the square of the distance between the objects. The gravitational pull between the Earth and the Moon causes the seas and the oceans on Earth to either rise or subside. This effect is called the tide, which changes between high tide and low tide according to the Moon’s position. One third of all tide effects on Earth are caused by the Sun’s pull and the rest is caused by the Moon’s.

The Moon gets 1.57 inches farther from the Earth every year due to the tide. It is known that the time taken for the Earth to turn around its axis completely (1 day) increases by 0.02 milliseconds every year so that this distancing effect can be countered and the angular momentum of the Earth and the Moon can be sustained. It is also known that the time taken for the Earth to turn around its axis was 8 hours when the Moon was first created, and that it increased to 24 hours since then. If the Moon had not been created, there wouldn’t have been any tide and because of that, one day would still be 8 hours. That would mean that the Earth would be spinning around its axis about 3 times faster than its current speed. A greater spinning speed of a planet might mean stronger winds on its surface. For example, Jupiter and Saturn spin around their axes very fast and have about ten hours in a day. This causes winds with speeds up to 300 miles/hour at the east-west direction on their surfaces. The dust storms that occur in the atmospheres of these planets are caused by these winds and can be seen from the Earth with a telescope.

Without the Moon, the Earth would have spun faster, causing a faster heat exchange among the air, seas and land. This, in turn, would have caused hurricanes in the east-west direction on the face of the Earth with speeds up to 100 miles/hour. Such conditions would have been very inconvenient to all complex life forms including human beings. Even simple tasks like speaking or listening could have been very difficult or even impossible. Since a day would have been eight hours, this would have caused a mismatch between the biological clock of living things – including human beings – and the flow of the day, resulting in biological complications. Without the Moon, the high tide would have been very weak, again causing a very inconvenient environment for sea creatures.

The Moon also has a role in keeping the Earth’s axis at a 23.5 angle. It is known that the seasons result from this and allows the right amount of sunlight to the equator and the poles, creating a climate appropriate for life. Another known effect of the Moon on the Earth is that it reflects the Sun’s light and heats up the Earth by 32.36°F (0.2°C). The Moon also serves as a shield against space rocks, and if it had not been for the Moon many more rocks and meteors would have hit the Earth.

Most of the cosmic rays that come from space are neutralized by the Earth’s magnetic field. Few of these rays reach the Earth and causes chemical reactions. Without the Moon, the core of the Earth would have spun faster along with the Earth itself. With the core of the Earth spinning faster, the magnetic field would have been much stronger. This would have caused huge changes in the atmosphere. Besides, some bacteria and animals that use the magnetic field to find their way (such as sea turtles, salmon, eels, pigeons, and migratory birds) would have been negatively affected. Consequently, many ecosystems, as we know them today, would have been different.

Another significant service of the Moon to our lives is that, like the Sun, it has been used as a calendar throughout human history. Muslims today observe their Ramadan fast according to their hijri calendar which is based on lunar measurement of time.

The Moon is the largest satellite that we know, in proportion to the size of the planet it is attracted by (the Moon’s mass measures 1.23 % of the Earth’s mass). The size of the Moon plays a critical role in the sensitive balance of our ecosystem. When the relationship between the Earth and the Moon is examined carefully, one could easily conclude that the Moon has been created specially for the life on Earth by the One Who “has made the heavens high and set up the balance” with a gentle measure, a great cause and benefit, and was given to the service of humankind.

Notes

1. Neil Comins. What If the Moon Didn’t Exist? Voyages to Earths That Might Have Been, New York: HarperCollins, 1993.
2. “The Sun and the Moon are by an exact calculation” (Quran 55:5).
3. Marcus Chown. “The Planet That Stalked the Earth,” New Scientist, August 14, 2004, pp. 27–30.
4. Paul D. Spudis. “Moon,” World Book Online Reference Center, NASA, 2004.
5. Tony Phillips, “What Neil & Buzz Left on the Moon,” Science, NASA 2004.
6. Richard Ray, “Ocean Tides and the Earth’s Rotation,” IERS, 2001.
7. Comins 1993.
8. Paul J. Henney, www.astronomytoday.com
9. John Gribbin, “A Mysterious Monthly Temperature Cycle,” New Scientist, pp. 18, January 28, 1995.
10. “We have obscured the sign of the night, and We have made the sign of the day illuminating to see, that you may seek bounty from your Lord and that you may know the computation of (time) the years and reckoning…” (Isra 17:12). This verse has been interpreted as to refer to the moon and the sun. “… He has made the night for repose, and the sun and the moon a means for reckoning (the divisions of time)…” (An’am 6:96) also refers to this fact. See Ali Unal, The Qur’an with Annotated Interpretation in Modern English, Tughra Books, 2008, p. 294, 570–71.
11. Quran 55:7.

Speed, movement over distance in time, is as old as the universe; the sensation of speed was ‘experienced’ as soon as man was created and covered distances by walking. Man has ever since extended and advanced his power of movement until speed has reached its present, dizzying level and continues to increase. Man first ‘enjoyed’ speed through his feet, then on the back of domesticated beasts, then in carts and carriages, then bicycles and motor-driven vehicles. Today, man is on the verge of defeating, even annihilating, distances. The annihilation of distance is already a reality in the case of sound and image transmission by processes far ahead of the transportation of objects.

Speed has brought more ease and comfort, but has also had negative consequences. Whether the positive consequences outweigh the negative ones is still an open question, one we can only answer by balancing the technological advances against real and substantial gain in human happiness and in the meaningfulness of human life.

Buses, trains, ships and planes, running on some advanced form of electrical energy, or in the further future space-craft run on some form of pure light energy, will make it possible to cover huge distances in minutes. We will, at the same time, be able to press a button and receive sounds, images, colours, even smells, from long distances. As ‘time’ and ‘space’ are effectively reduced, the earth will really become a global village.

Human conquests over time and space are, as we have noted, set to go much further, bringing with them, in addition to many facilities, numerous problems. We are bound to admire advances in scientific research, new inventions and their application – all the wonders of civilization. However, need this prevent us from asking whether the dazzling speed – attained through man’s commitment to investigating every detail of the ‘book of the universe’ – has really served the nobler aims, those rather more important for human life than speed by itself. If, by subjugating time and space, by contracting the world into a village and reducing time costs to near zero, speed cannot reach the higher goals, does it really benefit mankind? If science, penetrating into the universe’s remotest corners for knowledge of the whole of existence, made the whole world as familiar as our own neighbourhood, uncovered everything in it, making it, as it were, naked, and did not do so for the sake of the higher human values, needs and desires, would it not be a kind of ignominy to use such a science – to be familiar with the secrets of an individual or a nation, and able to expose them?

Is speed an end in itself? That is, are inventions and developments in transportation and telecommunication made just to indulge a crazy, unreflecting addiction to doing things ever faster? It is doubtful if these sophisticated means of transportation and communication have led to any great advance in human values. We wish that they had, so that we might look forward to the peaceful co-existence of the world’s peoples in a world contracted to a village. But it is impossible to claim that the technologies of speed serve any such goal at present.

If we argue that speed is desired, not for its own sake, but for the service of mankind’s loftier goals, can we also argue that faster cars or trains or planes really contribute to the attainment of these goals? If they do, we can aim to contract time and space still further – to the very limits of science-fictional imagination. But it is difficult to give a positive answer to that question: the present applications of speed technology are far from achieving the desired goals.

If speed is meant to save time, to get things done faster or to reach somewhere faster, but the time saved, the things done or the destinations reached, are not part of some higher aim more important than speed, then what is all the effort for? If we have no general aim for our speed technology and no specific intention to realize this aim, then all our effort and the time saved will be in vain – like streams of water flowing nowhere, or rain falling on barren ground. Today, some proponents of speed, heedless of any general aims in life, are greatly impressed by a technology that allows one to leave the earth’s atmosphere in a few minutes, to carry sounds and images many thousands of kilometres almost instantaneously. They value only the speed, they evaluate only the technology, detached from its general consequences. However, speed is only a material phenomenon. Without specific goals it can be neither a foundation for progress and civilization nor a means to the realization of human values.While mankind found happiness in centuries when they travelled on foot or horseback, they have in this century, unfortunately, suffered from the most horrifying kinds of brutality despite very sophisticated technology.

Speed has never been the most urgent need of mankind. It was and is only a means to an end. A balanced view is important. Some have idolized speed and glorified technological advances, regarding these as everything; others, reacting against the uselessness of speed without purpose, have become hostile to modern mechanisms of transport or communication.

Speed should serve specific aims. It is to be welcomed and valued as long as it enables the realization of human values and human aims; as long as it brings peace and happiness and ends pangs of separation; as long as it contributes to the general harmony of the world and the solution of worldly and other-worldly problems; and as long as it advances scientific research and empowers scientific establishments. Without these benefits, speed in movement or communication is no more than a meaningless, insecure illusion.

WHY OPTICAL?

Despite the many benefits that classical computers (‘classical’ here means computers in which the signals are carried electrically) have brought to our lives, they have some limitations which prevent any improvement in the speed or volume of signals carried. These limitations are inherent to the way these computers work.

For example, classic electric circuits carry information units serially, one by one, and there are some lower limits beyond which such circuits cannot be built-below that limit they simply cannot process the information reliably. Another handicap is that electrons floating in circuits can interfere with each other-and this interference, incidentally, is one reason why engineers cannot produce smaller circuits. By contrast, photons, light particles, which are the main signal or information carrying agent simply do not interact with each other because they do not carry a charge.

An optical computer could be run faster than one running electrons, theoretically at the speed of light, along optical fibres which are specifically designed guide-wires to transfer light-photons in and out between chips in an optical computer without distortion.

One of the main advantages of optical computers is their capability of processing more than one piece of information at the same moment. That means multi-beams can be processed in one chip. This would allow engineers to use parallel processing which greatly enhances the speed of the computer.

THE DIFFICULTIES

Lasers would, naturally, be the source of light in this new generation of computers. Scientists and engineers all over the world are trying to build appropriately tiny lasers emitting precise frequencies of infrared light. But they face a number of practical hurdles. One has to do with making lasers of appropriate size and efficiency. Current technology does not have the means to build optical chips comparable in size to ‘classical’ ones. The efficiency of the lasers is not high enough for the specifications required. Most of the energy to run these lasers escapes as heat and is not used. Since one or at most two percent of this energy can be transformed into the useful form of light, the rest can generate a lot of heat which is dangerous to the condition of the chips.

Making the right lasers is not the only problem on the way to fully optical computers. Switches are at the heart of optical computers, but as photons do not interact with each other, there are substaintial difficulties in building switches.

SOME PROPOSED SOLUTIONS

One solution to this problem is to build computers which are part electrical, part optical. Many scientists now believe that the most viable use for optical technology is in this type of hybrid system combining optics and electronics. Researchers are now focusing their work on optical interconnections between chips, which could be a reality in as little as one or two years. This type of connection can vastly increase the amount of data moving in and out of chips.

Such a machine would have to contain prisms, mirrors, and lasers to channel the light, as well as gallium arsenide chips that convert pulses of laser light into electrons so as to function as switches. If all this does happen, there will be a need for new computer architectures, that is, new computer structures.

However, there are some scientists following a different route. They are trying to find ways to use current transistor technology so as to detect laser beams in the information processing. NPN type transistors without a metal cover would be appropriate because they are faster. This approach also allows for adaptation of existing designs, with all the advantages in time and savings that brings.

FUTURE

The first optical processor developed at AT&T Bell Labs measured about two feet by two feet. Scientists hope some day to fit it all into three square inches. A fully optical computer is more than five years away.

Scientists have set themselves a target for the year 2000: 1,000 I/O (input and output) channels running at 1 giga-bit/sec. That is a thousand times faster than current modern computers.

It is a pity that we must wait for a decade, while scientists and engineers try to accomplish this difficult task. But what an exciting wait!

•  FURTHER READING
• ‘Bright future’, Scientific American, May 1990.
• ‘Now easier optical’, Electronics, May 1990.
• ‘Slacken lights up’, Scientific American, July 1991.
• ‘Optical computer no longer lighters away’, Byte, April 1992.
• ‘Optical computing sheds ‘blue sky’ image’ Electronics, April 1990.