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Their are civilizations capable of visiting us, but have not had time to reach us yet. For a variety of potential reasons, advanced civilizations have elected not to establish communication.Īdvanced civilizations are a more recent development in the universe.A lack of interest, motivation or organization, political explanation. There is a lack of resources in space that prevents long distance space travel.Michael Hart - Quarterly Journal of the Royal Astronomical Society, Vol. Some physical, astronomical, biological or engineering difficulty makes space travel infeasible. In all the infinite galaxies, stars, and combinations of planets, we are solitary in our uniqueness.

Advanced civilizations are purposefully eliminated.