> I would think it would be much 'cheaper' to bring one of Saturn's
> moons or an asteroid in than to push the moon out. Certainly asteroids
> provide the most control and/or fault tolerance. WRT 'restarting the
> core' should we be so concerned with mass? Let the Sun's gravity
> handle most of the v-squared part and worry less about the m?
If we just lob asteroids at it (unless perhaps in very quick
succession) it's unlikely to cause the heating and penetration
required to alter the core of Mars and ensure it is molten and in
motion (save perhaps for some unknown physics governing the process,
though from the limited studies of larger bodies without a magnetic
field than Mars, it seems unlikely that mass alone could cause the
effect). Using the Sun's gravity alone wouldn't work to maintain the
orbit, as you would have to break an orbit to begin with in the case
of Saturn's moons just like you would with our own and you would have
to accelerate Mars to a speed that allows the two to balance out when
they collide. If you didn't mind a degraded orbit (which might well
be better, for instance if you could get the resulting planet+moon
combination in the same orbit as Earth, but 180 degrees out of phase
or some other non-threatening difference) you would still have to
break orbit from Saturn, but you might be able to use some of the
gravity (not much) for acceleration toward Mars, with a big additional
kick to ensure it is able to penetrate into the planet with enough
force to get the molten interracial layer of the two into the middle.
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