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All guests, sorted alphabetically by last name.
Select a guest to view a list of appearances.
  1. Mike A'Hearn, Deep Impact's Principal Investigator
  2. Mark Adler, Spirit Mission Manager
  3. Tariq Adwan,
  4. Buzz Aldrin, Apollo 11 Astronaut
  5. Amir Alexander, Writer and Editor for planetary.org
  6. Claudia Alexander, Galileo Project Manager
  7. Carlton Allen, Curator, Johnson Space Center Astromaterials Lab
  8. Mark Allen, Principal Investigator for MARVEL
  9. Bob Anderson,
  10. Clay Anderson, Astronaut
  11. David Anderson, Project Director for SETI@Home
  12. John Anderson,
  13. Nigel Angold, Ulysses Mission Operations Manager
  14. Richard Arnold, NEEMO 13 Crew
  15. Sami Asmar, Manager of the Radio Science Group at the Jet Propulsion Laboratory
  16. Tim Bailey, space activist
  17. Kevin Baines, planetary scientist
  18. Donald Banfield, Cornell planetary scientist
  19. Reta Beebe, Astronomer
  20. Jim Bell, Mars Exploration Rover Pancam lead
  21. Greg Benford,
  22. Jim Benford,
  23. Bob Benjamin, Research Scientists
  24. Steve Benner, Foundation for Applied Molecular Evolution
  25. Bruce Betts, Director of Projects, The Planetary Society
  26. Alan Binder, Principal Investigator for Lunar Prospector
  27. Peter Birtwhistle, Amateur Astronomer
  28. Bill Blair, Astrophysicist
  29. Andre Bormanis, Star Trek writer and consultant
  30. Bill Boynton, Lead Scientist, Phoenix TEGA
  31. Ray Bradbury,
  32. David Brin, Science Fiction Author
  33. Mike Brown, an astronomer at CalTech and co-discoverer of the furthest kuiper belt object to orbit our sun
  34. Don Brownlee, Principal Investigator for the Stardust mission
  35. Roger Buick, Professor, University of Washington
  36. James D. Burke, Technical Editor of The Planetary Report
  37. Don Burnett, Genesis mission principal investigator and lead scientist
  38. John Callas, Mars Exploration Rover Program Manager
  39. James Cameron, Director, Producer, Writer
  40. John Casani, Prometheus Project Manager
  41. Robert Cassanova, Director of the NASA Institute for Advanced Concepts
  42. Andrew Chaikin, Author
  43. David Charbonneau, Harvard Astronomer
  44. Phil Christensen, Arizona State University planetary scientist
  45. Ben Clark, Lockheed Martin's Chief Scientist of Space Exploration
  46. Arthur C. Clarke, Author
  47. Geoffrey Collins, Planetary Scientist
  48. Joy Crisp, Project Scientist for the Mars Exploration Rover mission
  49. Glen Cushing, planetary scientist
  50. Shana Dale, NASA Deputy Administrator
  51. Thomas Dame, Radio Astronomer
  52. Matt Dawson,
  53. Imke de Pater, Astronomer
  54. Neil deGrasse Tyson, Director of the Hayden Planetarium in New York
  55. John Delaney, Oceanographer
  56. Greg Delory, University of California, Berkeley
  57. Tilmann Denk, Free University of Berlin
  58. Peter Diamandis, Chairman, X Prize Foundation
  59. Don Dixon, Space Artist
  60. Courtney Dressing, Student Astronaut
  61. Ann Druyan, writer and producer
  62. Dan Durda, Near Earth Object astronomer and astronomical painter
  63. Tom Duxbury, Jet Propulsion Laboratory
  64. Freeman Dyson,
  65. Ken Edgett, Malin Space Science Systems
  66. Charles Elachi, Jet Propulsion Laboratory Director
  67. Annmarie Eldering, Deputy Manager of JPL's Earth Atmospheric Science Section
  68. Richard Ellis, Professor of Astronomy at the California Institute of Technology
  69. Doug Ellison, blogger and founder of unmannedspaceflight.com
  70. Jim Erickson, Mars Exploration Rover Project Manager
  71. Wolfgang Fink, CalTech physicist/robotocist
  72. Bernard Foing, Project Scientist for SMART-1
  73. Jonathan Frakes, Director of Thunderbirds
  74. Louis Friedman,
  75. Satoshi Furukawa, NEEMO 13 Crew
  76. Owen Garriott,
  77. Lori Garver, Former Associate Administrator for Policy and Plans at NASA
  78. James Garvin, NASA's Chief Scientist
  79. Neil Gehrels, Principal Investigator for Swift
  80. Walter Goetz, Mars Exploration Rovers magnet team member from the University of Copenhagen
  81. Dan Goldin,
  82. Barry Goldstein, Project Manager for Phoenix
  83. Matt Golombek, Co-chair, Mars Exploration Rover Landing Site
  84. Jim Graf, MRO Project Manager
  85. Douglas Graham, XCOR Aerospace
  86. Stephen Grasby, Geologic Survey of Canada
  87. Jeff Greason, CEO, XCOR Aerospace
  88. Jack Gregg, Head, California Space Education & Workforce Institute
  89. Michael Griffin, NASA Administrator
  90. Mike Griffin, NASA Administrator
  91. Albert Haldemann, Deputy Project Scientist for the Mars Exploration Rover mission
  92. Heidi Hammel, planetary scientist and Planetary Society Board member
  93. Joe Harrington, Spitzer Space Telescope team member
  94. Alan Harris, one of many scientists working to protect our little planet from Near Earth Objects
  95. William Hartmann, Planetary scientist, author, and artist
  96. Ken Herkenhoff, Lead Scientist for the Mars Exploration Rover's Microscopic Imager
  97. Homer Hickam, Author and Former NASA Engineer
  98. Paul Hill,
  99. Victoria Hipkin, Lead Scientist, Phoenix MET
  100. Jeff Hoffman, Astronaut
  101. Mark Hofstadter, Jet Propulsion Laboratory
  102. Paul Horowitz, Harvard Astrophysicist
  103. Robert Lee Hotz, a Pulitzer Prize-winning science writer for the Los Angeles Times
  104. Justin Houchin, a 17-year-old from Sunland, California, could be the first teenager in space
  105. Andrew Howard,
  106. Steve Howell, Astrophysicist
  107. Wes Huntress, Planetary Society President and Former NASA Associate Administrator
  108. Wendy Jaeger, planetary scientist
  109. Thomas Janka, Max Planck Institute for Astrophysics
  110. Torrence Johnson,
  111. Tom Jones, Astronaut
  112. Junichiro Kawaguchi, Hayabusa Project Manager
  113. Charles Kennel, Space Studies Board Chair
  114. Bettyann Kevles, Author
  115. Andrew Knoll, Harvard biologist and science team member for the Mars Rover project
  116. Charley Kohlhase, Engineer, Artist, Cassini Mission Designer
  117. Detlef Koschny, European Space Operations Centre
  118. Michael Krepon, Head of the Space Security Project
  119. Liz Kruesi, Astrophysics Graduate Student
  120. Emily Lakdawalla, Science and Technology Coordinator, The Planetary Society
  121. Yuval Landau,
  122. Jean-Pierre Lebreton, Huygens Mission Manager and Project Scientist
  123. Wayne Lee, Mars Exploration Rover Entry, Descent and Landing Chief Engineer
  124. Guillermo Lemarchand, Director of Southern SETI
  125. Mark Lemmon, Lead Scientist, Phoenix SSI
  126. Laurie Leshin, Principal Investigator for SCIM
  127. Joel Levine, Principal Investigator for ARES
  128. Chris Lewicki, Flight Director for the Mars Exploration Rover Missions
  129. Slava Linkin, Russian Federation Space Research Institute
  130. Alexis Livanos, Northrop Grumman Space Technology President
  131. Mario Livio, Space Telescope Science Institute
  132. Jon Lomberg, Visions of Mars Project Director
  133. Rosaly Lopes, JPL
  134. M. G. Lord, Author of Astro Turf
  135. Ralph Lorenz, planetary scientist
  136. Christophe Lovis, Geneva Observatory
  137. Rob Manning, Entry, Descent and Landing Development Manager for Spirit and Opportunity
  138. Geoff Marcy, UC Berkeley astronomer
  139. Brian Marsden, Retired Director of the IAU's Minor Planet Center
  140. Robin Mason, filmmaker
  141. Todd Mason, filmmaker
  142. Richard Massey, Astronomer
  143. Jake Maule, Arctic Mars Analogue Svalbard Expedition
  144. Dan McClese, Mars Reconnaissance Orbiter Mars Climate Sounder principal investigator
  145. Art McDonald, Director of the Sudbury Neutrino Observatory
  146. Alfred McEwen, Principal Investigator for HiRISE
  147. Lucy McFadden, Deep Impact Co-Investigator
  148. James McGaha, Amateur Astronomer
  149. Chris McKay, Famed planetary scientist
  150. Bill McKinnon, planetary scientist
  151. Curtis Mead, Research Assistant, All-Sky Optical SETI
  152. Michael Meyer, Astronomer, University of Arizona
  153. Berrien Moore, Climate Central Executive Director
  154. Rafael Morozowski, Student Astronaut
  155. David Morrison, Interim Director, NASA's Lunar Science Institute
  156. Philip Morrison, Famed Physicist and SETI Pioneer
  157. Bruce Murray, Planetary Society founder
  158. Elon Musk, Founder of SpaceX
  159. Gerhard Neukum,
  160. Nichelle Nichols,
  161. Bill Nye,
  162. James Oberg, Writer and expert on international space programs
  163. Adriana Ocampo, Senior Scientist, European Space Agency
  164. Mike Okuda, graphic artist, Star Trek
  165. Steve Ostro, Radar Astronomer
  166. Toby Owen, Planetary Scientist
  167. Larry Page, Google co-founder
  168. Bob Pappalardo, Principal Scientist, Jet Propulsion Laboratory
  169. Tim Parker, Jet Propulsion Laboratory
  170. Nicholas Patrick, NEEMO 13 Crew
  171. Robert Picardo,
  172. Carle Pieters, planetary scientist
  173. Jeffrey Plaut, Jet Propulsion Laboratory
  174. Linda Purl, Actor
  175. Margaret Race, Ecologist
  176. Lisa Randall, Harvard physicist
  177. Marc Rayman, Deep Space 1 Project Manager
  178. John Rhys-Davies, Actor
  179. Sally Ride, First American Woman in Space
  180. Massimo Robberto, Astronomer
  181. Kim Robinson, Science Fiction Author
  182. Kim Stanley Robinson, Science Fiction Author
  183. Rod Roddenberry, writer
  184. Lawrence Rudnick, Astronomer
  185. John Rummel,
  186. Chris Russell, Dawn Principal Investigator
  187. Burt Rutan, SpaceShipOne
  188. Roald Sagdeev, former Director of the Soviet Space Research Institute
  189. Gerry Sanders, NASA's In Situ Resource Utilization Project
  190. Scott Sandford, Co-Investigator, Stardust
  191. Harrison Schmitt, Moonwalker
  192. Gerhard Schwehm, Rosetta Project Scientist
  193. Rusty Schweickart, Apollo 9 Astronaut
  194. Ben Shelef, Spaceward Foundation founder
  195. Donna Shirley, Planetary Society Advisory Council
  196. Mark Showalter, planetary astronomer
  197. Peter Smith, Principal Investigator for Phoenix
  198. Dava Sobel, Author
  199. B. Thomas Soifer, Director of the Spitzer Science Center
  200. Claudio Sollazzo, Mission Operations Manager
  201. Sean Solomon, Principal Investigator for MESSENGER
  202. John Spencer, Cassini Team Member
  203. Linda Spilker, Cassini Deputy Project Scientist
  204. Tom Spilker, JPL Engineer
  205. Steve Squyres, Principal Investigator for the Athena Science Payloads on the two Mars Exploration Rovers
  206. Andrew Stanton, WALL*E Creator
  207. Andrew Steele, Arctic Mars Analogue Svalbard Expedition
  208. Alan Stern, Principal Investigator, New Horizons
  209. S. Alan Stern, Principal Investigator of New Horizons Mission to Pluto
  210. David Stevenson, Caltech planetary scientist
  211. Ellen Stofan, Cassini Radar Team
  212. Ed Stone, Former Director of the Jet Propulsion Laboratory
  213. Woody Sullivan, UW Astronomer
  214. Jessica Sunshine, spectroscopist and Deep Impact co-investigator
  215. Hakan Svedhem, Project Scientist for Venus Express
  216. Håkan Svedhem, Venus Express Project Scientist
  217. Mark Swain, Jet Propulsion Laboratory
  218. Mark Sykes, Director of the Planetary Science Institute
  219. Alex Tai, Vice President for Operations, Virgin Galactic
  220. Kenneth Tanaka, United States Geological Survey
  221. Stacy Tearne, Director of Communications, Space Adventures
  222. Robert Bruce Thompson, co-author, Illustrated Guide to Astronomical Wonders
  223. Tim Titus, planetary scientist
  224. Clyde Tombaugh, Pluto's discoverer
  225. Roy Tucker,
  226. Elizabeth Turtle, Planetary scientist
  227. Slava Turyshev,
  228. Stephane Udry, Astronomer
  229. Jurrie van der Woude,
  230. John Vilja, Pratt and Whitney Rocketdyne's Program Manager
  231. Bettye Walker, Cofounder, A-Man International Science Discovery & Learning Center
  232. Hal Walker, Cofounder, A-Man International Science Discovery & Learning Center
  233. Steve Wall, Deputy Team Leader, Cassini RADAR
  234. David Warmflash, NASA Astrobiology Institute
  235. Edward Weiler, NASA Associate Administrator
  236. Dan Wertheimer, SETI Scientist
  237. Dan Werthimer, UC Berkeley SETI Chief Scientist
  238. Andrew Westphal, Stardust science team member
  239. Cheryl Wheeler, Singer, Songwriter
  240. Roger Wiens, Genesis Mission Team Member
  241. Mark Wolverton, Author
  242. J. Judson Wynne, USGS Speleologist
  243. Don Yeomans, Manager of NASA's Near Earth Object Program Office
  244. John Young, Astronaut
  245. Alexander Zakharov, Russian Space Research Institute
  246. Rich Zurek, MRO Project Scientist