Like Hawking, I cannot sit here and look up into the sky and think we're alone, completely in the universe... But, at the same time while we ponder such things, what holds us back is the fact that we're all ultimately selfish, and often misguided... We know we cannot sustain ourselves, or this planet forever, but we continue to destroy more everyday... How could we present ourselves to an ET from another planet, if we cannot even work out our own domestic agenda's?...