Hear me out okay. hits blunt Dyson ring. Maybe we start building it out between earth and Mars. We dig a big ass hole into Mars core and use some kind of laser technology to focus radiation into it perhaps "jump starting" the core. Or maybe we use some kind of cable and gymbal system to run a hard wire into it. hits blunt Then meanwhile we're crashing comets and shit into it to get us some oceans and atmosphere, badabing badaboom we got earth 2.0