I believe there are aliens who have already worked out this secret, otherwise how else could they have come down to visit our earth as we know our nearest neighboring galaxy is some quite a few thousands of years away.
aah, but now you are going to say there are no aliens like there is no God!
I think the secret is if you can convert yourself and your space ship from its physical form into a non physical form, and then bugger off at a speed of light and when you get near your destination, you slow down and re-convert yourself and your spaceship back into matter form, and land on a distant planet that may be thousands of years away.