Guests: Dr. Roger Launius, Andrew Johnston. Topics: space exploration, geography, Hubble, human spaceflight. Dr. Roger Launius and Andrew Johnston were the guests for this Space Show program to discuss their excellent new book, "Atlas of Space Exploration." You can find out more about this book from the One Giant Leap Foundation book website, www.onegiantleapfoundation.org/books.htm. We started our discussion by talking about ancient observatories and then observation versus exploration.