Obviously Matter/AntiMatter engine is the way to go (anti matter is real and is currently produced), but that whole warp bubble thing currently seems problematic, maybe those CERN guys working on the giant collider can solve that one.

>It has occurred to me that if mankind is going to expand to other planets sometime in
>the future (The sooner the better) then a new engine type must be invented.
>Chemical rockets will not do it and solar sails only work in solar wind.
>Ion engines are not powerful enough either. If anti-gravity becomes possible
>it will need gravity to work againts to produce motion and the further away
>from a gravitaional source, the weaker it would get. So, do you have any ideas
>on a solution for this future NASA problem?