Do we? Our physics today suggest there are hard limits. We do have some creative theories (Alcubierre, wormholes) to work around those limits, but they could r

Do we? Our physics today suggest there are hard limits. We do have some creative theories (Alcubierre, wormholes) to work around those limits, but they could run into issues and in current forms require massive energy that could well be impossible to generate or harvest. Laser/solar sails seem most likely to me, but could be limited to small payloads and the general vicinity of our solar system. As much as I like sci-fi and real science, it seems quite likely that there are physical limits that keep intelligent life constrained to their solar system. Space is really really big.