Based on papers like this, I suspect that some form of sub-FTL "warp" drive may be at least physically possible. Whether it's practical to build any time in the

Based on papers like this, I suspect that some form of sub-FTL "warp" drive may be at least physically possible. Whether it's practical to build any time in the foreseeable future is another question. The energy requirements would be beyond what we can do today and would probably require highly efficient compact fusion.