To different star systems obviously. Short of discovering portals or wormholes (natural or artificial), we should only assume demonstrated space propulsion tec

To different star systems obviously. Short of discovering portals or wormholes (natural or artificial), we should only assume demonstrated space propulsion technology to make the trip. With current technology its a long trip, and its cold and dark inbetween 2 stars. We should definitely conserve fissile materials until we demonstrate fusible materials for reliable power generation.