WARP DRIVE
Could it really exist? We think so, yes. We know from Einstein that space is like a fabric (called space-time) and that the fabric can be bent or twisted. If we had a technology that would compress space-time at the front of our spaceship and at the same time expand it at the rear of our spaceship then we would have a hyperdrive system. Sounds easy eh? The only way of compressing the fabric of space is to use a large amount of mass (like a star or a black hole). A definite challenge, and one beyond us for the foreseeable future. However, that doesn't mean it's impossible.