how do we know? all the scientist nows is that we cant breath in space ( space is a big vaccum basically ) we cant walk ( we float ) and we only know about OUR planets/solar system.. we dont know how any other solar system/planets work, we have barly even studied all of ours yet, let alone assuming others work like earth.. we just dont know enough about other planets to make asumptions...
You did NOT just say that...
I... I don't even think I can respond without saying things that I probably shouldn't in a public forum. No wonder you don't require scientific proof of anything. You obviously don't know the first thing about science. That's all I'm going to say for fear of getting myself in trouble for flaming.