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The first and most widely known hypothesis – the emphasis on the vast spaces in the universe. Why can not we “encounter” aliens? If the planet had life in the Milky Way, it could be thousands of light-years away from Earth. This makes communication in the universe impossible. Biker to my son dad poster. Also, for other Galaxies millions of light years away, communication becomes even more difficult. Many experts believe that the huge distance is the factor preventing our communication with our “friends” from outside the Earth.