I enjoyed these two: * In Search of Planet Vulcan, by Richard Baum and William Sheehan * The Northern Lights, by Lucy Jago Both are more about the scienti

I enjoyed these two: * In Search of Planet Vulcan, by Richard Baum and William Sheehan * The Northern Lights, by Lucy Jago Both are more about the scientists and astronomers than about NASA space missions, but I found both very interesting. If you prefer something a bit lighter, Men from Earth by Buzz Aldrin was pretty good.