Neil deGrasse Tyson Talks New Book, Aliens, UFO Sightings

Famed astrophysicist Neil deGrasse Tyson joins Saturday TODAY to chat about this new book “Take Me to Your Leader: Perspectives on Your First Alien Encounter” and reveals who he thinks aliens should meet with when they arrive on Earth. He also shares why Stephen Colbert pushed him into a “worm hole” on the “Late Show” finale, saying, “When you have a No. 1 hit show that gets canceled, that is a disruption in the order of the universe.”