the claim that civilizations could never travel to, what is more, communicate with other interstellar civilizations is to assume the current state of human science complete and the universal epitome par excellence.

as much as humankind does know of the universe, it knows next to nothing. human science is far far from complete and interstellar travel and communication will reveal itself given time and the perseverance of great minds of course.

as to whether or not we are alone ... i cannot imagine it to be so. life is too abundant and too resilient on earth and possibly within the solar system to be devoid throughout the cosmos. i have mixed beliefs about the authenticity of ufo sightings. i do not exclude the possibility that some are legitimate, but am more inclined to believe ufos (the kind that are not obvious hoaxes) are government experimental craft.