Neil degrasse tyson on why aliens don t visit earth 02:04 Neil deGrasse Tyson Doubles Down on Why Aliens Haven't Visited Earth (Part 28) 10:24 Neil deGrasse Tyson shares what he thinks aliens would say about Earth 19:53 Have Aliens Visited Earth? | StarTalk 101 with Neil deGrasse Tyson 1:21:06 Why Can't We See Evidence of Alien Life? | Documentary 03:03 Neil deGrasse Tyson Explains Why UFOs Aren't Visiting Space Aliens (Part 27) 03:32 Neil deGrasse Tyson Is Worried That Humans Are Too Stupid For Aliens 19:44 Neil deGrasse Tyson:" Voyager 1 Has Detected 500 Unknown Objects Passing By In Space" 55:09 Watch Neil deGrasse Tyson BUST Alien MYTHS for an Hour!! 08:58 Neil deGrasse Tyson Does Not Believe UFOs Are on Earth. 04:47 Neil deGrasse Tyson: Want to prove aliens exist? Do this 19:20 Neil deGrasse Tyson Explains Alien Visits, UFOs, and Other Conspiracies 04:32 Neil deGrasse Tyson – "UFO" Doesn't Mean "Aliens" 06:34 Neil Degrasse Tyson Thinks Aliens Have Visited Earth?! || Dropouts Podcast Clips 11:29 Are We Alone? Neil deGrasse Tyson on Alien Life & The Fermi Paradox 09:38 "We Might Have 100 Years Left!" Neil deGrasse Tyson On The World Ending 06:58 Neil deGrasse Tyson Uses Aliens To Make Points About Our Human Perspective 12:12 The Fermi Paradox With Neil deGrasse Tyson - Where Are All The Aliens? 10:31 The Aliens Are Here? Neil deGrasse Tyson on UFO's & Alien Life 10:25 Are we Being Visited by Aliens? Neil deGrasse Tyson on UFO's 1:03:56 Neil deGrasse Tyson: On Aliens, Artificial Intelligence, & The Future of Civilization. More results