This lends more credence to theories of traversing vast distances. It's been considered for some time that if there are aliens out there who have visited Earth, they may have used the theory of bending time and space using a form of gravity generator.
For example, your craft is at point A and you wish to travel to point B, which may be several light years away. You could "bend / pull" point a to point b so they become one. You then travel a very short distance crossing into point b. When the gravitational pull is released, point b returns to where it actually was and you go with it. In other words, you travel in jumps.
It's been surmised we can not reach the speed of light in linear travel, you can get close, but no cigar. Your craft would have mass, as you accelerate mass it effectively gains more mass, so needs more power to increase it's speed...and so on. You would need an engine of infinite power, as you're in a never ending circle. Ion powered engines have been considered, but even then it's theoretical and the craft would need a scoop several miles across to trap enough ions.
Back to the topic. It's been considered possible, that when travelling in a linear fashion, you could expand time and space in front of the craft as it travels forward, but compress it back behind. That means that although travelling at less than the speed of light, the distance covered would be in excess that you would have covered if travelling at the speed of light.
All interesting stuff really.