>>10815222Well if it's a rogue planet you've got to consider that it's traveling at stellar escape velocity, so you're going to need to bleed that off so it can get captured by the sun.
So use mass drivers to slingshot enough stuff to slow it down enough to fall into a meta-stable orbit.
You'd also have to get lucky that the rogue planet was even traveling in the general neighborhood of the star system. Space is big, and its easier to miss everything then it is to hit something.
Really, you might want to not bother catching it at all, and just intercept it. It would be like a massive interstellar space ship.
If it was a big enough terrestrial world it might even still be warm enough at the core that geothermal vents could keep pockets on the surface from being frozen solid.
