We have gone far enough to know that when the fuel on
the surface of our globe is all used up we shall only have to tap the
center to get all the heat we want." "What a capital idea that will be," I
interrupted, "to throw at some of our pessimistic friends on the earth,
Doctor."
"We see now, Thorwald," my companion said, "that your planet is too old to
give you any more trouble from earthquake and volcano, but how about other
natural phenomena, the tempest and cyclone for example?"
"Well," replied Thorwald, "we have a theory that time, the great healer,
has cured these evils also. Let me ask, Doctor, if the earth ever receives
any accretions of matter from outside its own atmosphere?"
"Yes, we have the fall of meteorites, foreign substances which we believe
the earth encounters in its path around the sun."
"I supposed such must be the case," Thorwald continued. "And now, when you
consider the great age of Mars, perhaps you will not be surprised to learn
that this new matter, coming to us from the outside, was sufficient to
increase the weight of our globe and gradually decrease the rate of speed
at which we were traveling through space.
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