In November 2011, astrophysicist Neil deGrasse Tyson talked about what leaves him awestruck.
Question: What is your favorite fact about the universe?
neiltyson: That it will never end. That it's on a one way trip of expansion. Something that many find to be philosophically unsettling. My view is that if your philosophy is not unsettled daily then you are blind to all the universe has to offer.