Neil deGrasse Tyson - Is It A Comet or Alien Technology?

 https://www.youtube.com/watch?v=FsyzVoIuUGU  

The Object That Will Change Your View of Space Forever (or not) https://www.youtube.com/watch?v=b2_M-1YqnNI

Brian Cox Explains The Fermi Paradox https://www.youtube.com/watch?v=NbNPBcUgDTs