> Liquid hydrogen is an even better shield and it's something we currently have the technology to use. First get your liquid hydrogen (and any other similar so

> Liquid hydrogen is an even better shield and it's something we currently have the technology to use. First get your liquid hydrogen (and any other similar solutions) into orbit. I used to be (in the 70s) gung-ho for space colonies, but really the economics simply don't make sense with anything like current drive technologies, or indeed any in the foreseeable future. In my opinion, the answer to the Fermi Paradox is that putting intelligent living organisms into space for their lifetimes is simply far, far too difficult.