For you scientifically inclined types out there (which I'm assuming is everyone in this community), how possible would it be to exploit fusion reactor technology to create orbiting "mini-suns" to heat up planetary bodies in the outer solar system and aid in terraforming? I envision mini-suns not lasting very long (500 years?) but being easily replaceable at End of Life, and placed at the right orbit for a comfortable temperature.
I've also wondered how possible it would be to build rings around planetary bodies (either in orbit or directly on the ground) to simulate magnetic fields, thus providing protection from harmful cosmic rays.
Are these ideas completely outside the realm of possibility?