The Author. Herschel, having examined the sky of the southern hemisphere from the Cape of Good Hope, in applying his observations to the whole extent of the Milky Way, estimated the number of suns comprised in that immense nebulæ at 18 millions. I have just told you the length of the Milky Way. A ray of light emitted from a star at one of its extremities, and reaching the other, would take 15,000 years to accomplish the transit. So that, when we are looking through the telescope at one of the suns of this nebula, we receive the impression of a ray of light emitted from that star 7000 or 8000 years ago, i.e., long before the dawn of the historic ages.[28] The measurement of the Milky Way enables us therefore to measure the extent of other nebulæ, still more distant from us. There are, as I have already said, masses of diffused light in the midst of nebulæ which telescopic analysis has resolved into stars, which are probably much more distant nebulæ. The real distance of these luminous masses can be fixed. If it were asked, to what distance the Milky Way should be removed in order to offer us the aspect of an ordinary nebula, Arago would answer that according to his researches, the Milky Way ought to be removed to a distance equal to 334 times its length. According to this the Milky Way would be seen from the earth at an angle of 10°, and its light would take 5,010,000 years to travel that distance. Thus, light would take more than five millions of years to travel from one of the telescopic nebulæ to our earth. Such are the intervals which exist in the universe, and which our instruments can appreciate. It seems to me that we are now on the borders of the Infinite.
Theophilus. We are indeed.
The Author. When we know that those terrible distances, which appal the imagination, are only the results of observations made by our telescopes, and capable of any amount of extension; when we reflect that the innumerable worlds thus revealed to us continue farther and farther, that ever new agglomerations of suns, planetary earths and their satellites add themselves to those which we can measure, without limit and without end, that the imagination cannot err in following them to the uttermost limits of its powers; then, my dear Theophilus, we comprehend that the universe is truly infinite. And if you consider that these endless ranks of solar systems have all their following of planets and satellites, filled with living beings, plants, animals, men, and superhuman creatures, that flaming comets traverse the orbit of each world at intervals and plunge into the burning furnace of its sun; that these milliards of suns are endlessly various, and that all the complicated motions of these different systems are accomplished with perfect order, without any mutual disturbance, you will find that the universe is not only the infinite in extent, but, also in order, harmony, equilibrium of motion, and laws!
Theophilus. The mind loses itself in such thoughts; for the idea of the infinite is not made for our feeble intelligence. Let us go no farther, or our reason will fail us.
The Author. Nevertheless, I must pursue my long argument to the end. I must add that in the midst of this boundless space, above this immense cortége of stars, which are the dwelling places of living creatures and sentient souls, there exists the Supreme Author, the Sovereign Ordainer, from Whom, as their sacred source, all that our eyes behold, our souls feel, and our intelligence admires, is derived. He, whom I bless with all the gratitude of my heart—God!
Theophilus. Thus, then, you have reached the true object of your discourse. This journey through space is undertaken to prove that God, being infinite in moral perfections, may be placed in that infinitude in extent, called the universe. It only remains now to say in what precise spot you place the sojourn of the Divinity, for I do not see how there can be a centre to the Infinite, seeing it has neither beginning nor end.
The Author. I am about to explain myself on this point. The absolute fixity of the sun and the stars was an astronomical principle, which, in the time of Newton, appeared to be indubitable. But science never stands still. Observations made in the present century have proved that the fixity, the immobility of the sun is only relative. The truth is that the sun, and with him the entire system of planets, asteroïds, satellites, and comets, which he carries, in his train, change their places, very slightly no doubt, but still appreciably. Our sun appears to advance slowly, with all the planetary family, towards that part of the sky in which the constellation of Hercules is situated, at the rate of 62,000,000 of leagues each year, or two leagues each second, describing an orbit which comprehends millions of centuries. That which is the case with our sun is equally the case with the other suns, that is to say, the stars. This general motion of translation must be common to all the stellar systems, and it is indubitable that the countless millions of solar systems suspended in infinite space, are moving more or less quickly towards an unknown point in the sky. Now, there is nothing to forbid the supposition that all these circles or ellipses traced by myriads of solar systems, have a common centre of attraction, towards which our system and all the others gravitate. Thus, all these celestial bodies, without exception, all this ant-hill of worlds which we have enumerated, may be turning round one point, one centre of attraction. What forbids us to believe that God dwells at this centre of attraction for all the worlds which fill infinite space?
Theophilus. Now I understand your thought, and I am struck by its grandeur. This God, placed at the mathematical centre of the worlds which compose the universe, this infinite intelligence, throned in the centre of the infinite universe, and presiding over the movements of all the innumerable phalanxes of heavenly bodies which our imagination can conceive, responds to the idea which we form of God, if we venture to face the awful personality of His Omnipotence. You have done well to develop this theory in your work. It will be in harmony with the kind of religious spirit which animates it, and which is, besides, the expression of the desires, and the aspirations of the men of our time.
In the present day a deep and profound need of belief in Providence makes itself felt. Men want to render homage to God, in whom they feel there is truth, peace, and safety for the present and in the future. But the established religions leave many minds in cruel uncertainty. In "The Day after Death" you have endeavoured to lay the foundations of the religion of science and of nature. These principles respond, as I believe, to the prevalent wishes of mankind. They satisfy the mind and the heart, sentiment and reason; they console and strengthen; in short, they consecrate the idea of God, without laying aside either the universe or nature.
The Author. So be it!