actually, there is no agreement amoung them. the closest to any agreement that has been reached is that if you can reach low earth orbit, your half way to the stars. Once we reach that point, it becomes a shouting match about which would be better.

I myself think it would be better to use solar sails (light powered actually) to grap a few near earth asteroids and turn them into space ships. then you go with a large enough crew to where ever it is you decide you want to go.

the more man learns, the more he realises, he really does not know anything.