"In about two weeks," replied Mr. Roumann. "I want to make a few
changes in the Cardite plates, which will replace the ones used on the
Etherium motor. Then I want to test them, and, if I find that they work
all right, as I hope, we will seal ourselves up in the _Annihilator_,
and start for the moon."
"Are you going to try to go around it, and land on the side turned away
from us?" asked Mark, who had been studying astronomy lately.
"What do you mean by that?" asked Jack. "Doesn't the moon turn around?"
"Not as the earth does," replied his chum; "or, rather, to be more
exact, it rotates exactly as the earth does, on its axis; but, in doing
this it occupies precisely the same time that it takes to make a
revolution about our planet. So that, in the long run, to quote from my
astronomy, it keeps the same side always toward the earth; and today,
or, to be more correct, each night that the moon is visible, we see the
same face and aspect that Galileo did when he first looked at it
through his telescope, and, unless something happens, the same thing
will continue for thousands of years.
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