"Monsieur has not gone down yet?" said the custodian, coming up to the top. "I was waiting to lock the doors, and thought the experiments must be over."
[IV.]
THE FIXED POINT IN THE UNIVERSE.
THE memory of Urania and the celestial journey on which she had borne me away, the truths she had made me realize, Spero's history, his trials in his pursuit of the absolute, his apparition, his story of another world, still haunted me, and kept the same problems (partly solved, partly veiled in the uncertainty of our knowledge) incessantly before my mind. I felt that I had gradually risen to a perception of the truth, and that the visible universe was really but an appearance, which we must pass through in order to reach reality.
The testimony of our senses is but an illusion. The Earth is not what it seems to be. Nature is not what we think. In the physical universe itself, where is the fixed point upon which material creation is in equilibrium?
The natural and direct impression given by the observation of Nature is that we inhabit a solid, stable Earth, fixed in the centre of the universe. It took long centuries of study and a great deal of boldness to free ourselves from that natural conviction, and to realize that the world we are on is isolated in space, without any support whatever, in rapid motion on itself and around the Sun. But to the ages before scientific analysis, to primitive peoples, and even to-day to three quarters of the human race, our feet are resting on a solid Earth which is fixed at the base of the universe, and whose foundations are supposed to extend into the depths of the infinite.
And yet from the time when it was first realized that it is the same Sun which rises and sets every day; that it is the same Moon, the same stars, the same constellations which revolve about us, those very facts forced one to admit with absolute certainty that there must be empty space underneath the Earth, to let the stars of the firmament pass from their setting to their rising. This first recognition was a turning-point. The admission of the Earth's isolation in space was astronomy's first triumph. It was the first step, and indeed the most difficult one. Think of it! To give up the foundations of the Earth! Such an idea would never have sprung from any brain without the study of the stars, or indeed without the transparency of the atmosphere. Under a perpetually cloudy sky, human thoughts would have remained fixed on terrestrial ground like the oyster to the rock.