Astrophysicist Neil DeGrasse Tyson reacts to videos of alleged UFOs and explores the possibility of whether humans on Earth are alone in the universe.
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WATCH the ABC News Live Stream Here: https://www.youtube.com/watch?v=w_Ma8oQLmSM
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#ABCNLPrime #NeilDeGrasseTyson #Astrophysicist #UFO #Universe #IntelligentLife
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