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"The air is denser. We must be some depths--a mile even, we may
be--inside the moon."
"
"
"
"
We never thought of a world inside the moon."
No."
How could we?"
We might have done. Only one gets into habits of mind."
He thought for a time.
"Now," he said, "it seems such an obvious thing."
"Of course! The moon must be enormously cavernous, with an atmosphere
within, and at the centre of its caverns a sea.
"
One knew that the moon had a lower specific gravity than the earth, one
knew that it had little air or water outside, one knew, too, that it was
sister planet to the earth, and that it was unaccountable that it should
be different in composition. The inference that it was hollowed out was as
clear as day. And yet one never saw it as a fact. Kepler, of course--"
His voice had the interest now of a man who has discerned a pretty
sequence of reasoning.
129
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