Chris Hadfield

Bestselling author and celebrated astronaut Chris Hadfield will give an illustrated talk about his new book, You Are Here, which creates a virtual orbit of Earth, giving us the really big picture: this is our home, from space.

The millions of us who followed Hadfield's news-making Twitter feed from the ISS thought we knew what we were looking at when we first saw his photos. But we may have caught the beauty and missed the full meaning.