A floating city on a comet would be a dream and a nightmare all at once. The weak gravity means you’d have to tether things to the nucleus or use magnetic levitation. Then there’s the radiation—cosmic rays and solar wind would bite through any flimsy hull unless you use the comet’s dust as a shield. And the lighting? With only a tiny sunlit spot, you’d have to sculpt the interior with mirrors and reflectors to make any semblance of day. It’s a fascinating blend of art and hard physics, but the practical hurdles would be immense.