It is not possible and funky sci-fi physics doesn't count. Lets start off with how distant 31 light years is. that's 2.9x1014 km. Ok Im assuming we will not live if we accelerate faster than 1g, so let's accelerate at 1g for half that distance. It would take around 6 years to travel 15 light years if we went 1g. How much fuel do you think it takes a rocket to accelerate for 6 years at 1g? I had no idea where to start calculating this, so I found a nice article on quora. https://www.quora.com/How-much-fuel-any-type-would-it-take-to-accelerate-a-rocket-to-lightspeed-at-1G-with-Newtonian-only-physics In short - 'In half a day [of 1g acceleration] you’d need a mass of fuel greater than the entire mass of the Earth.'