Neil deGrasse Tyson explains the relatively recent phenomenon of UFO footage and if they in fact mean aliens are visiting us. We've been wondering whether we are alone in the Universe since the dawn of civilization. But it's only in recent years that this question has gotten much much more ...

NASA Has Made a Shocking Discovery About Extraterrestrial Life. Could it change everything we thought we knew about our species? The biggest conundrum - outside the questions on how our universe came to be - is whether we are alone in our solar system, our galaxy, or even in the entire ...

Intragalactic Alien Civilizations With Neil deGrasse Tyson Subscribe to Science Time: https://www.youtube.com/sciencetime24 Neil deGrasse Tyson explains the possibility of alien civilizations existing in our galaxy the milky way. Many people believe we've been visited by intelligent aliens ...