# NASA Theoretical Faster Than Light Space Travel (IXS-Enterprise)

I was recently reading about NASA Faster than Light proposed spaceship, it supposedly will bend spacetime behind the spacecraft, so technically instead of bringing the ship to the destination, "it will bring the destination to you." now, I have an understanding of calculus-based physics, and a basic understanding of relativity.

From my lackluster knowledge of relativity, by conventional means achieving the speed of light is nearly impossible if not impossible, according to Special Relativity. if I am not mistaken if we try using a spaceship, as we approach the speed of light because of relativity, wouldn't the mass of the spaceship go to infinity? and if we have infinite mass doesn't it mean we need an infinite amount of energy to push it?

Even so, if we travel to say alpha centauri, which is 4.4 light-years away it will probably take around a month to go there at the speed of light, which is not bad. It will take a month for the traveler to go there, what about those outside?

to put it simpler, if someone goes to Alpha Centauri at the speed of light and he comes back, how much time would have passed in Earth?

(I would have used, calculations to illustrate better, but I do not know how to use equations in Stack-Exchange yet.)

• The equations on Physics.SE are from MathJax, a few details can be found here. Commented Jun 20, 2014 at 1:41
• Also, if something is 4.4 lightyears away, it will take 4.4 years to get there at the speed of light. Commented Jun 20, 2014 at 1:42
• That is their claim. Note, though, that they claim that it would be traveling faster than light, not at light speed. There is a lot on this site about the intended "warp drive" they think they can create. Commented Jun 20, 2014 at 2:30
• The fact is that you cannot travel faster than the speed of light in direct terms. There is a loophole in this theory. If you can bend space, using 'warp drive' (still a theoretical concept) you are travelling a shorter distance to reach your final destination. However, your displacement is much larger. As speed is the distance traveled divided by time taken, you never actually exceed the speed of light. You just find a shortcut. It's as if you're saying you can't travel faster than a car, but you can reach the destination faster if you find a shortcut. Commented Jun 20, 2014 at 6:51
• Are you asking how the Alcubierre drive works? Or are you just asking about travel times to stars using conventional drives. If the latter see How long would it take me to travel to a distant star?. If the former see Harold White's paper. Commented Jun 20, 2014 at 9:57