[NOTE: I usually ignore this type of stuff, labeling it as pseudo-science, but the source is reliable.]
According to the linked article, faster than light travel is not only theoretically possible but is something that we might be able to implement. This would change everything. The method, known as an Alcubierre drive, hinges on the fact that we can’t reach the speed of light while moving through spacetime, but spacetime itself does not have that restriction (for instance, the universe has expanded much more quickly than lightspeed). There are still major technical challenges, however, as the energy requirement is very high—the energy in a mass the size of the Voyager 1 probe is, I believe, much more than any nuclear bomb every created.
Thanks to O.Roy for this link.