Twice the gravity of earth will not allow humans to easily adapt to other planets.
Not that we'll reach a 1,400 light year planet any time soon. With our current capabilities, it takes a space probe 70,000 years to reach the closest star system, the alpha centauri etc. And that's only 4 light years away. Of course "only" is a relative term, because it is a massive distance for us to cover but in the context of a universe its a blip. We're better off terraforming mars and releasing green house gases there.