Example image of eyePlorer eyePlorer map for 'Steven Soter': American Museum of Natural History Doctor of Philosophy New York University IAU definition of planet International Astronomical Union Cornell University University of California, Los Angeles Carl Sagan Iapetus (moon) Phoebe (moon) Cosmos: A Personal Voyage Blue Planet Cosmic Voyage Hayden Planetarium Clearing the neighbourhood Definition of planet Scientific American Ann Druyan Helike Boura (Achaea) Dwarf planet Planet Rings of Saturn