While SR states one can never measure a velocity greater than C, for all practical purposes one can travel 'faster than light'. Here is what I mean. . . Lets assume I have a Spaceship with the means of constantly accelerating at 1G. The fact that this is technologically unfeasible is irrelevant to the principles involved. We choose a destination and for our purposes assume linear travel. I calculate that one is able to travel many light years of distance within a human lifetime. We will base this though experiment on SR and traveling at constant acceleration of 1G. We will acclerate for the first half of the trip and decelerate for the second half. Obviously would could just keep accelerating forever if we wanted to get there faster, but this would leave us going to fast to enjoy the destination. I calculate the time it takes using: Time(years) = SQRT(Distance/2*2/accel)*2 I attached a Excel file showing various times for various distances you want to travel at 1G or 2G in your POV and Earth's POV. In summary from Earth's POV you will asymptotically accelerate toward C so for long distances it would take you roughly 1 year per light year. But from your POV, for practical purposes, you would be able to travel: 4 light years in 3.94 years using 3.7E20 J of energy 100 light years in 19.7 years using 9.3E21 J of energy 1000 light years in 62.31 years using 9.3E22 J of energy Given 10^22 J of energy you could feasibly travel 1000 light-years in your lifetime!(what is really happening is that the energy is shrinking space to allow you to travel that far, but for all practical purposes of travel this works) to put the energy in perspective, a large nuclear exploxive can give 8.4E13 J of energy so we would need 10 million times this much energy to travel 4 light years in 3.94 years which is entirely possible but highly improbable.