The universe, at the instant of the Big Bang 13.7 billion years ago, was an 'infinitely small dot' containing its total (and constant) energy. At that point — just before space-time came into existence — some of the energy within our energy-only 'dot universe', for some unknown reason, began to convert into matter, creating at the same time the energy-matter-space-time framework we perceive as our universe...

The Magnificent Dot.

After a lot of conjecture and speculation and theorizing, pretty much all working astronomers believe in this so-called Big Bang picture, in which the universe started out really small at some time roughly 15 billion years ago. It exploded. All of this stuff came out of it. But the thing that's so hard for us to picture is, the explosion of something that started the size of a dot, all the matter and all the energy, but in addition, all the space was in there. And when the thing exploded, not only did all this matter and energy come out of this explosion, but all the space came out of it too. So we were in there. And the concept of what was outside the dot before the dot exploded, it turns out is a non-concept because all the space was inside there too. Imponderable stuff. And so the subject of cosmology, the origin of the universe, and all that kind of stuff is a kind of mixture of science and philosphy, a very interesting subject and very hard to come to grips with.

-- Frank Bash - Director, McDonald Observatory
Showing posts with label milky way. Show all posts
Showing posts with label milky way. Show all posts

A Theologian's Nightmare by Bertrand Russell

The eminent theologian Dr. Thaddeus dreamt that he died and pursued his course toward heaven. His studies had prepared him and he had no difficulty in finding the way. He knocked at the door of heaven, and was met with a closer scrutiny than he expected. "I ask admission," he said, "because I was a good man and devoted my life to the glory of God." "Man?" said the janitor, "What is that? And how could such a funny creature as you do anything to promote the glory of God?" Dr. Thaddeus was astonished. "You surely cannot be ignorant of man. You must be aware that man is the supreme work of the Creator." "As to that," said the janitor, "I am sorry to hurt your feelings, but what you're saying is news to me. I doubt if anybody up here has ever heard of this thing you call 'man.' However, since you seem distressed, you shall have a chance of consulting our librarian."

The librarian, a globular being with a thousand eyes and one mouth, bent some of his eyes upon Dr. Thaddeus. "What is this?" he asked the janitor. "This," replied the janitor, "says that it is a member of a species called 'man,' which lives in a place called 'Earth.' It has some odd notion that the Creator takes a special interest in this place and this species. I thought perhaps you could enlighten it." "Well," said the librarian kindly to the theologian, "perhaps you can tall me where this place is that you call 'Earth.'" "Oh," said the theologian, "it's part of the Solar System." "And what is the Solar System?" asked the librarian. "Oh," said the theologian, somewhat disconcerted, "my province was Sacred Knowledge, but the question that you are asking belongs to profane knowledge. However, I have learnt enough from my astronomical friends to be able to tell you that the Solar System is part of the Milky Way." "And what is the Milky Way?" asked the librarian. "Oh, the Milky Way is one of the Galaxies, of which, I am told, there are some hundred million." "Well, well," said the librarian, "you could hardly expect me to remember one out of so many. But I do remember to have heard the word galaxy' before. In fact, I believe that one of our sub-librarians specializes in galaxies. Let us send for him and see whether he can help."

After no very long time, the galactic sub-librarian made his appearance. In shape, he was a dodecahedron. It was clear that at one time his surface had been bright, but the dust of the shelves had rendered him dim and opaque. The librarian explained to him that Dr. Thaddeus, in endeavoring to account for his origin, had mentioned galaxies, and it was hoped that information could be obtained from the galactic section of the library. "Well," said the sub-librarian, "I suppose it might become possible in time, but as there are a hundred million galaxies, and each has a volume to itself, it takes some time to find any particular volume. Which is it that this odd molecule desires?" "It is the one called 'The Milky Way,'" Dr. Thaddeus falteringly replied. "All right," said the sub- librarian, "I will find it if I can."

Some three weeks later, he returned, explaining that the extraordinarily efficient card index in the galactic section of the library had enabled him to locate the galaxy as number QX 321,762. "We have employed," he said, "all the five thousand clerks in the galactic section on this search. Perhaps you would like to see the clerk who is specially concerned with the galaxy in question?" The clerk was sent for and turned out to be an octahedron with an eye in each face and a mouth in one of them. He was surprised and dazed to find himself in such a glittering region, away from the shadowy limbo of his shelves. Pulling himself together, he asked, rather shyly, "What is it you wish to know about my galaxy?" Dr. Thaddeus spoke up: "What I want is to know about the Solar System, a collection of heavenly bodies revolving about one of the stars in your galaxy. The star about which they revolve is called 'the Sun.'" "Humph," said the librarian of the Milky Way, "it was hard enough to hit upon the right galaxy, but to hit upon the right star in the galaxy is far more difficult. I know that there are about three hundred billion stars in the galaxy, but I have no knowledge, myself, that would distinguish one of them from another. I believe, however, that at one time a list of the whole three hundred billion was demanded by the Administration and that it is still stored in the basement. If you think it worth while, I will engage special labor from the Other Place to search for this particular star."

It was agreed that, since the question had arisen and since Dr. Thaddeus was evidently suffering some distress, this might be the wisest course.

Several years later, a very weary and dispirited tetrahedron presented himself before the galactic sub-librarian. "I have," he said, "at last discovered the particular star concerning which inquiries have been made, but I am quite at a loss to imagine why it has aroused any special interest. It closely resembles a great many other stars in the same galaxy. It is of average size and temperature, and is surrounded by very much smaller bodies called 'planets.' After minute investigation, I discovered that some, at least, of these planets have parasites, and I think that this thing which has been making inquiries must be one of them."

At this point, Dr. Thaddeus burst out in a passionate and indignant lament: "Why, oh why, did the Creator conceal from us poor inhabitants of Earth that it was not we who prompted Him to create the Heavens? Throughout my long life, I have served Him diligently, believing that He would notice my service and reward me with Eternal Bliss. And now, it seems that He was not even aware that I existed. You tell me that I am an infinitesimal animalcule on a tiny body revolving round an insignificant member of a collection of three hundred billion stars, which is only one of many millions of such collections. I cannot bear it, and can no longer adore my Creator." "Very well," said the janitor, "then you can go to the Other Place."

Here the theologian awoke. "The power of Satan over our sleeping imagination is terrifying," he muttered.


(1961)

An Account of Formation of the Solar System in Jules Verne

An observer endued with an infinite range of vision, and placed in that unknown center around which the entire world revolves, might have beheld myriads of atoms filling all space during the chaotic epoch of the universe. Little by little, as ages went on, a change took place; a general law of attraction manifested itself, to which the hitherto errant atoms became obedient: these atoms combined together chemically according to their affinities, formed themselves into molecules, and composed those nebulous masses with which the depths of the heavens are strewed. These masses became immediately endued with a rotary motion around their own central point. This center, formed of indefinite molecules, began to revolve around its own axis during its gradual condensation; then, following the immutable laws of mechanics, in proportion as its bulk diminished by condensation, its rotary motion became accelerated, and these two effects continuing, the result was the formation of one principal star, the center of the nebulous mass.

By attentively watching, the observer would then have perceived the other molecules of the mass, following the example of this central star, become likewise condensed by gradually accelerated rotation, and gravitating round it in the shape of innumerable stars. Thus was formed the Nebulae, of which astronomers have reckoned up nearly 5,000.

Among these 5,000 nebulae there is one which has received the name of the Milky Way, and which contains eighteen millions of stars, each of which has become the center of a solar world.

If the observer had then specially directed his attention to one of the more humble and less brilliant of these stellar bodies, a star of the fourth class, that which is arrogantly called the Sun, all the phenomena to which the formation of the Universe is to be ascribed would have been successively fulfilled before his eyes. In fact, he would have perceived this sun, as yet in the gaseous state, and composed of moving molecules, revolving round its axis in order to accomplish its work of concentration. This motion, faithful to the laws of mechanics, would have been accelerated with the diminution of its volume; and a moment would have arrived when the centrifugal force would have overpowered the centripetal, which causes the molecules all to tend toward the center.

Another phenomenon would now have passed before the observer's eye, and the molecules situated on the plane of the equator, escaping like a stone from a sling of which the cord had suddenly snapped, would have formed around the sun sundry concentric rings resembling that of Saturn. In their turn, again, these rings of cosmical matter, excited by a rotary motion about the central mass, would have been broken up and decomposed into secondary nebulosities, that is to say, into planets. Similarly he would have observed these planets throw off one or more rings each, which became the origin of the secondary bodies which we call satellites.

Thus, then, advancing from atom to molecule, from molecule to nebulous mass, from that to principal star, from star to sun, from sun to planet, and hence to satellite, we have the whole series of transformations undergone by the heavenly bodies during the first days of the world.

The sun seems lost amidst the immensities of the stellar universe, and yet it is related, by actual theories of science, to the nebula of the Milky Way. Centre of a world, and small as it appears amidst the ethereal regions, it is still enormous, for its size is 1,400,000 times that of the earth. Around it gravitate eight planets, struck off from its own mass in the first days of creation. These are, in proceeding from the nearest to the most distant, Mercury, Venus, the Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Between Mars and Jupiter circulate regularly other smaller bodies, the wandering debris, perhaps, of a star broken up into thousands of pieces, of which the telescope has discovered eighty-two at present. Some of these asteroids are so small that they could be walked round in a single day by going at a gymnastic pace.

Now, of those attendant bodies which the sun maintains in their elliptical orbits by the great law of gravitation, some few in turn possess satellites. Uranus has eight, Saturn eight, Jupiter four, Neptune possibly three, and the Earth one. This last, one of the least important of the entire solar system, we call the Moon; and it is she whom the daring genius of the Americans professed its intention of conquering.


-- From the Earth to the Moon, Jules Verne, Chapter 5