Re: Dyson Sphere
How would they know the door would have some kind of AI that prevented them from a second attempt, until they'd tried it? in which case it would be too late, or they'd have to wait until they could get through again
I think you answered your own question - "Why take the chance?"
One day soon, man is going to be able to harness incredible energies, energies that could ultimately hurl us to other worlds in... some sort of spaceship.