A Movie with Tom hanks in it (maybe?)?

Its about this couple who live in this dome type thing(Some type of "shielding" not necessarily a dome), and are able to maintain a high standard of living because of it. However the majority of people live outside of the dome and are unshielded from something from space(radiation, asteroids, not quite sure), and have basically reverted to a hunter gather lifestyle. This couple are both doctors and that's how they met. Then when one of them leaves the "dome" to help the people outside, he or she disappears, and the other one embarks on a journey to save he or she. I think it may have tom hanks in it but its a long shot. There is also a possibility it was one of those TV movies. Either way, I would be very happy if anyone could give me the name.