Discusses the discovery, physical characteristics, and exploration of the planet closest to the Sun. Gregory L. Vogt began his professional career as a science teacher. He later joined NASA's education programs, teaching students and teachers about space exploration. He works in outreach programs for the Kennedy Space Center. He is also the principal investigator for an educational grant with the National Space Biomedical Research Institute. Vogt has written more than seventy science books for children. Used Book in Good Condition