What is the most astounding fact?

Accompanied by some amazing and breathtaking footage and graphics of Earth and space, the following video sees astrophysicist Dr. Neil DeGrasse Tyson answering “What is the most astounding fact you can share with us about the Universe?” after he was asked the question by a reader of TIME magazine. This is his answer.

Neil goes on to say “For me, that is the most profound revelation of 20th century astrophysics and I look forward to what the 21st century will bring us, given the frontiers that are now unfolding.”