I wasn't talking about using a building machine on the Moon, though,
of course, that is possible. I was talking about having self-
replicating nanobots loose on Earth. That requires a backup of
humanity on off-world colonies.
Since they found water on Mars, the Moon will just be a staging area
and spaceport. Water on Mars changes the picture.
Assuming they don't learn to create nanospaceships and go after us.
...Well, you never know.
I may have previously mentioned hereon something of bombarding Mars
beforehand with moons, comets, asteroids, meteors, etc., as well as its
own moons Phobos and Diemos to get Mars up to the kind of mass needed to
retain a sufficient Earth-like atmosphere/gravity. Of course some of
these kinds of mods might have unforeseen consequences for planetary
orbits, such as the Earth's... Not that that would matter if it was
infested with evil-doing nanobots.
Another idea in tandem might include sucking up/compressing some of
Venus' atmosphere into ships to ship to Mars and release.
At some point thereafter, you could then have your seas and limestone. ;)
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