Krustez

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See this Scientific American Article

And this FAQ

On page 2 it
says "The laws of special relativity make it impossible to accelerate an object beyond c. As the object's speed approaches c, its mass increases. If you keep on applying a force to make the object go faster, more and more of the energy that you transfer to the object goes into increasing its mass (the old E=mc2). Because of the object's greater mass, the force you apply increases the object's speed more slowly. The object's speed becomes incrementally closer to c without ever quite reaching it. Achieving c would take infinite energy.

However, that reasoning only rules out the possibility of accelerating objects continuously from below c to above c. One can postulate the existence of elementary particles that always travel faster than c. These particles, called tachyons, would have fundamental properties unlike those of familiar particles such as electrons. For example, tachyons would gain mass as they were slowed down closer and closer to c. Conversely, their energy would decrease as they sped up, reaching a minimum at infinite velocity--which would be as accessible to a tachyon as zero velocity is to an ordinary particle. The mass of a tachyon would be imaginary, in the sense of imaginary numbers and the square root of minus one"