classical_hero
In whom I trust
FTL. And don't say it isn't theoretically possible! Our scientists just don't know how it would be theoretically possible yet, that's all.
I have to say that it is not theoretically possible to go far than the speed of light, since you basically need infinite energy for it to be possible.
I don't think any of the ideas are theoretically possible. Fusion could be the closest one we get to, but there have to be massive technological advances for it to be even possible.