Vacuum is not good place for humans. I aggree that we need to explore , but we don't know how many species we have here on Earth , we don't know all species in oceans and seas. I would first like to explore human body to the fulest, then find the way to heal or reproduce damaged parts of it. Then after that send us to where you want. Second is efficient interplanetary travel. We can not sustain this gravity shoots and impulse driven rockets that we have today. We need something more .