But this, immense as it is, is only one system of worlds. Beyond this, at a vast distance into space, far beyond all power of calculation, are the stars called the fixed stars. They are called fixed, because they have no revolutionary motion, as the six worlds or planets have that I have been describing. Those fixed stars continue always at the same distance from each other, and always in the same place, as the Sun does in the center of our system. The probability, therefore, is that each of those fixed stars is also a Sun, round which another system of worlds or planets, though too remote for us to discover, performs its revolutions, as our system of worlds does round our central Sun. By this easy progression of ideas, the immensity of space will appear to us to be filled with systems of worlds; and that no part of space lies at waste, any more than any part of our globe of earth and water is left unoccupied.
Having thus endeavoured to convey, in a familiar and easy manner, some idea of the structure of the universe, I return to explain what I before alluded to, namely, the great benefits arising to man in consequence of the Creator having made a Plurality of worlds, such as our system is, consisting of a central Sun and six worlds, besides satellites, in preference to that of creating one world only of a vast extent.
CHAPTER XV - ADVANTAGES OF THE EXISTENCE OF MANY WORLDS IN EACH SOLAR
SYSTEM.
IT is an idea I have never lost sight of, that all our knowledge of science is derived from the revolutions (exhibited to our eye and from thence to our understanding) which those several planets or worlds of which our system is composed make in their circuit round the Sun.
Had then the quantity of matter which these six worlds contain been blended into one solitary globe, the consequence to us would have been, that either no revolutionary motion would have existed, or not a sufficiency of it to give us the ideas and the knowledge of science we now have; and it is from the sciences that all the mechanical arts that contribute so much to our earthly felicity and comfort are derived.
As therefore the Creator made nothing in vain, so also must it be believed that he organized the structure of the universe in the most advantageous manner for the benefit of man; and as we see, and from experience feel, the benefits we derive from the structure of the universe, formed as it is, which benefits we should not have had the opportunity of enjoying if the structure, so far as relates to our system, had been a solitary globe, we can discover at least one reason why a plurality of worlds has been made, and that reason calls forth the devotional gratitude of man, as well as his admiration.
But it is not to us, the inhabitants of this globe, only, that the benefits arising from a plurality of worlds are limited. The inhabitants of each of the worlds of which our system is composed, enjoy the same opportunities of knowledge as we do. They behold the revolutionary motions of our earth, as we behold theirs. All the planets revolve in sight of each other; and, therefore, the same universal school of science presents itself to all.
Neither does the knowledge stop here. The system of worlds next to us exhibits, in its revolutions, the same principles and school of science, to the inhabitants of their system, as our system does to us, and in like manner throughout the immensity of space.