This Article talks about something Shea heard on the radio today, that scientists want to move the earth into a higher orbit using comets or asteroids. They acknowledge that it could in fact destroy all life if they missed, or strip the earth of the moon.
Or this article talks about how even other planets and moons could be moved into more earth like orbits and turned into earth type planets. Sounds crazy. They say the earth will have to encounter a 62 mile asteroid every 6000 years for it to move, it would take millions of years, it would move very slowly as the sun slowly got brighter. I wonder if you could move stars too, why not?