"If we used chemical fuel rockets like the Apollo mission to the moon, the journey to the nearest star would take 50,000 years. This is obviously far too long to be practical, so science fiction has developed the idea of warp drive, which takes you instantly to your destination. Unfortunately, this would violate the scientific law which says that nothing can travel faster than light.
"However, we can still within the law, by using matter/antimatter annihilation, and reach speeds just below the speed of light. With that, it would be possible to reach the next star in about six years, though it wouldn't seem so long for those on board."
I don't know about you, but Stephen Hawking is making this Trekker blush this morning.