Re: a mere 4.3 light years away
While it's not possible to travel at or beyond the speed of light, there may be workarounds, such as proposed by Alcubierre. And who knows.. a lot of the tech we take for granted these days was 'impossible' less than a century ago. We've only even been meaningfully using electricity for less than 150 years.
Personally I'd love to live to see the development and implementation of a 'warp drive' or similar, but unfortunately I doubt we'll even have a manned mission to Mars before I die.