Quote:
Originally Posted by Racer
Ah yes I forgot that one ! How practical do you reckon that is ? At least multiple Asteroid flybys are practical & feasible by foreseeable technologies . Even moving a small solid moon ( NOT Phobos or Deimos ) is fairly practical , but large asteroids are closer .
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The technique I generally see used is called a gravity tractor. Its more often proposed for asteroids than for earth, but its still the technique you'd want to use. Which means you're melting down several asteroids and building a solid sturdy craft. Instead of doing multiple flyby's, you put it in orbit and move it when its in front and and when its behind where you want to go.
Yes, that will take a while and it will take a lot of energy, but you're moving a planet, so what did you expect?
The solution to short term heat problems from an astroengineering standpoint is usually orbital shades, which are much much cheaper.