You can't accelerate the mass of even a single human at 1g for 6 years using current physics and a feasible ship design. You'll need generation ships to get any

You can't accelerate the mass of even a single human at 1g for 6 years using current physics and a feasible ship design. You'll need generation ships to get anywhere. Though I do like some scifi stories I've read where the first humans went our on generation ships and in the meantime a new physics was developed that allowed those target stars to be colonized hundreds and even a thousand years before they arrive. But developing a new physics presumes much.