"We are being visited," he said. "It is now time to put away this embargo of truth about the alien presence. I call upon our government to open up ... and become a part of this planetary community that is now trying to take our proper role as a spacefaring civilisation."
Mitchell, who has a PhD in aeronautics and astronautics from the Massachusetts Institute of Technology, said it's only a matter of time before we need to evacuate Earth and seek a new home. "The sun will burn out in due course, and we have to be off this planet if our species is to survive. At this point in human history on this planet, we're now starting, and should be, to reach out beyond our planet and then beyond our solar system to find out what is really going on out there."