Brian Greene told the audience at TED that the wonder we see is not only mysterious, but a limited-run engagement. Greene is a theoretical physicist who has been engaging the public through books, PBS specials, and by organizing the World Science Festival. Here, Greene was in cosmologist mode, talking about how the Universe is going to change in ways that will fundamentally alter how it can be observed.Astronomers in the far future will not have the beautiful night sky we have. In fact, unless they have our knowledge and scientific records, they will think that the Universe is a dark, static and unchanging place. Why will our night sky go black? The expansion of our Universe will eventually push other galaxies so far from us that we will no longer see them, even with advanced equipment. Light cannot overcome all distances, Greene said, describing a future where all we can see are the galaxies in our immediate neighborhood.