astonishingly light. Five-sixths of our own weight, and of the weight of the air-tight suits in which we were incased, had magically dropped from us. It was therefore comparatively easy for us, encumbered as we were, to make our way about on the moon.
But when we were far from both the earth and the moon, the loss of weight was more astonishing still—not astonishing because we had not known that it would be so, but nevertheless a surprising phenomenon in contrast with our lifelong experience on the earth.
Men Without Weight.
In open space we were practically without weight. Only the mass of the electrical car in which we were enclosed attracted us, and inside that we could place ourselves in any position without falling. We could float in the air. There were no up and no down, no top and no bottom for us. Stepping outside the car, it would have been easy for us to spring away from it and leave it forever.
One of the most startling experiences that I have ever had was one day when we were navigating space about half way between the earth and Mars. I had stepped outside the car with Lord Kelvin, both of us, of course, wearing our air-tight suits. We were perfectly well aware what would be the consequence of detaching ourselves from the car as we moved along. We should still retain the forward motion of the car, and of course accompany it in its flight. There would be no falling one way or the other. The car would have a tendency to draw us back again by its attraction, but this tendency would be very slight, and practically inappreciable at a distance.
Stepping Into Space.
"I am going to step off," I suddenly said to Lord Kelvin. "Of course I shall keep right along with the car, and step aboard again when I am ready."
"Quite right on general principles, young man," replied the great savant, "but beware in what manner you step off. Remember, if you give your body an impulse sufficient to carry it away from the car to any considerable distance, you will be unable to get back again, unless we can catch you with a boathook or a fishline. Out there in empty space you will have nothing to kick against, and you will be unable to propel yourself in the direction of the car, and its attraction is so feeble that we should probably arrive at Mars before it had drawn you back again."
All this was, of course, perfectly self-evident, yet I believe that but for the warning word of Lord Kelvin, I should have been rash enough to step out into empty space with sufficient force to have separated myself hopelessly from the electrical ship.
A Reckless Experiment.
As it was, I took good care to retain a hold upon a projecting portion of the car. Occasionally cautiously releasing my grip, I experienced for a few minutes the delicious, indescribable pleasure of being a little planet swinging through space, with nothing to hold me up and nothing to interfere with my motion.
Mr. Edison, happening to come upon the deck of the ship at this time, and seeing what we were about, at once said:
"I must provide against this danger. If I do not, there is a chance that we shall arrive at Mars with the ships half empty and the crews floating helplessly around us."
Edison Always Prepared.
Mr. Edison's way of guarding against the danger was by contriving a little apparatus, modeled after that which was the governing force of the electrical ships themselves, and which, being enclosed in the air-tight suits, enabled their wearers to manipulate the electrical charge upon them in such a way that they could make excursions from the cars into open space like steam launches from a ship, going and returning at their will.
These little machines being rapidly manufactured, for Mr. Edison had a miniature laboratory aboard, were distributed about the squadron, and henceforth we had the pleasure of paying and receiving visits among the various members of the fleet.
But to return from this digression to our experience of the asteroid. The latter being a body of some mass was, of course, able to impart to us a measurable degree of weight. Being five miles in diameter, on the assumption that its mean density was the same as that of the earth, the weight of bodies on its surface should have borne the same ratio to their weight upon the earth that the radius of the asteroid bore to the radius of the earth; in other words, as 1 to 1,600.
Having made this mental calculation, I knew that my weight, being 150 pounds on the earth, should on this asteroid be an ounce and a half.
Curious to see whether fact would bear out theory, I had myself weighed with a spring balance. Mr. Edison, Lord Kelvin and the other distinguished scientists stood by watching the operation with great interest.
To our complete surprise, my weight, instead of coming out an ounce and a half, as it should have done, on the supposition that the mean density of the asteroid resembled that of the earth—a very liberal supposition on the side of the asteroid, by the way—actually came out five ounces and a quarter!
"What in the world makes me so heavy?" I asked.
"Yes, indeed, what an elephant you have become," said Mr. Edison.
Lord Kelvin screwed his eyeglass in his eye, and carefully inspected the balance.
Weight, Five and a Quarter Ounces.
"It's quite right," he said. "You do indeed weigh five ounces and a quarter. Too much; altogether too much," he added. "You shouldn't do it, you know."
"Perhaps the fault is in the asteroid," suggested Professor Sylvanus P. Thompson.
"Quite so," exclaimed Lord Kelvin, a look of sudden comprehension overspreading his features. "No doubt it is the internal constitution of the asteroid which is the cause of the anomaly. We must look into that. Let me see? This gentleman's weight is three and one-half times as great as it ought to be. What element is there whose density exceeds the mean density of the earth in about that proportion?"
"Gold," exclaimed one of the party.
The Golden Asteroid!
For a moment we were startled beyond expression. The truth had flashed upon us.
This must be a golden planet—this little asteroid. If it were not composed internally of gold it could never have made me weigh three times more than I ought to weigh.
"But where is the gold?" cried one.
"Covered up, of course," said Lord Kelvin. "Buried in star dust. This asteroid could not have continued to travel for millions of years through regions of space strewn with meteoric particles without becoming covered with the inevitable dust and grime of such a journey. We must dig down, and then doubtless we shall find the metal."
This hint was instantly acted upon. Something that would serve for a spade was seized by one of the men, and in a few minutes a hole had been dug in the comparatively light soil of the asteroid.
The Precious Metal Discovered.
I shall never forget the sight, nor the exclamations of wonder that broke forth from all of us standing around, when the yellow gleam of the precious metal appeared under the "star dust." Collected in huge masses it reflected the light of the sun from its hiding place.
Evidently the planet was not a solid ball of gold, formed like a bullet run in a mould, but was composed of nuggets of various sizes, which had come together here under the influence of their mutual gravitation, and formed a little metallic planet.
Judging by the test of weight which we had already tried, and which had led to the discovery of the gold, the composition of the asteroid must be the same to its very centre.
An Incredible Phenomenon.
In an assemblage of famous scientific men such as this the discovery of course immediately led to questions as to the origin of this incredible phenomenon.