Crashing Planets Together

--- In spacesettlers@yahoogroups.com, Michael wrote:
> Hi,
>
> I went through the figures last night for moving planets out of
orbit and
> crashing them into other planets to make them easier to terraform.
There
> were four different sceanrios:

>

Perhaps I'm missing the obvious here, so could you explain how this
pertains to space settlements? What possible application could this
have for constructing a Habitat, peopling it, describing its economy
or society?

TangoMan