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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, Jet Propulsion Laboratory
  18. Donald Banfield, Cornell planetary scientist
  19. Reta Beebe, Astronomer
  20. Jim Bell, Cornell University
  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, Co-Producer of Star Trek Enterprise
  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 for the NASA Institute for Advanced Concepts
  42. Andrew Chaikin, Author
  43. David Charbonneau, Harvard Astronomer
  44. Phil Christensen, TES and THEMIS Principal Investigator
  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, Mars Microphone Developer
  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,
  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. Doug Ellison, blogger and founder of unmannedspaceflight.com
  69. Jim Erickson, Mars Exploration Rover Project Manager
  70. Wolfgang Fink, CalTech physicist/robotocist
  71. Bernard Foing, Project Scientist for SMART-1
  72. Jonathan Frakes, Director of Thunderbirds
  73. Louis Friedman, Planetary Society Executive Director
  74. Satoshi Furukawa, NEEMO 13 Crew
  75. Owen Garriott,
  76. Lori Garver, Former Associate Administrator for Policy and Plans at NASA
  77. James Garvin, NASA's Chief Scientist
  78. Neil Gehrels,
  79. Walter Goetz, Mars Exploration Rovers magnet team member from the University of Copenhagen
  80. Dan Goldin,
  81. Barry Goldstein, Project Manager for Phoenix
  82. Matt Golombek, Co-chair, Mars Exploration Rover Landing Site
  83. Jim Graf, MRO Project Manager
  84. Douglas Graham, XCOR Aerospace
  85. Stephen Grasby, Geologic Survey of Canada
  86. Jeff Greason, CEO, XCOR Aerospace
  87. Jack Gregg, Head, California Space Education & Workforce Institute
  88. Michael Griffin, NASA Administrator
  89. Mike Griffin, NASA Administrator
  90. Albert Haldemann, Deputy Project Scientist for the Mars Exploration Rover mission
  91. Heidi Hammel, Co-Director of Research for the Space Science Institute
  92. Joe Harrington, Spitzer Space Telescope team member
  93. Alan Harris, one of many scientists working to protect our little planet from Near Earth Objects
  94. William Hartmann, Planetary scientist, author, and artist
  95. Ken Herkenhoff, Lead Scientist for the Mars Exploration Rover's Microscopic Imager
  96. Homer Hickam, Author and Former NASA Engineer
  97. Paul Hill,
  98. Victoria Hipkin, Lead Scientist, Phoenix MET
  99. Jeff Hoffman, Astronaut
  100. Mark Hofstadter, Jet Propulsion Laboratory
  101. Paul Horowitz, Harvard Astrophysicist
  102. Robert Lee Hotz, a Pulitzer Prize-winning science writer for the Los Angeles Times
  103. Justin Houchin, a 17-year-old from Sunland, California, could be the first teenager in space
  104. Andrew Howard,
  105. Steve Howell, Astrophysicist
  106. Wes Huntress, Planetary Society President and Former NASA Associate Administrator
  107. Wendy Jaeger, planetary scientist
  108. Thomas Janka, Max Planck Institute for Astrophysics
  109. Torrence Johnson,
  110. Tom Jones, Astronaut
  111. Junichiro Kawaguchi, Hayabusa Project Manager
  112. Charles Kennel, Space Studies Board Chair
  113. Bettyann Kevles, Author
  114. Andrew Knoll, Harvard biologist and science team member for the Mars Rover project
  115. Charley Kohlhase, Engineer, Artist, Cassini Mission Designer
  116. Detlef Koschny, European Space Operations Centre
  117. Michael Krepon, Head of the Space Security Project
  118. Liz Kruesi, Astrophysics Graduate Student
  119. Emily Lakdawalla, Science and Technology Coordinator, The Planetary Society
  120. Yuval Landau,
  121. Jean-Pierre Lebreton, Huygens Mission Manager and Project Scientist
  122. Wayne Lee, Mars Exploration Rover Entry, Descent and Landing Chief Engineer
  123. Guillermo Lemarchand, Director of Southern SETI
  124. Mark Lemmon, Lead Scientist, Phoenix SSI
  125. Laurie Leshin, Principal Investigator for SCIM
  126. Joel Levine, Principal Investigator for ARES
  127. Chris Lewicki, Flight Director for the Mars Exploration Rover Missions
  128. Slava Linkin, Russian Federation Space Research Institute
  129. Alexis Livanos, Northrop Grumman Space Technology President
  130. Mario Livio, Space Telescope Science Institute
  131. Jon Lomberg, Visions of Mars Project Director
  132. Rosaly Lopes, JPL
  133. M. G. Lord, Author of Astro Turf
  134. Ralph Lorenz, planetary scientist
  135. Christophe Lovis, Geneva Observatory
  136. Rob Manning, Chief Engineer, JPL Mars Exploration Directorate
  137. Geoff Marcy, Professional planet hunter
  138. Brian Marsden, Retired Director of the IAU's Minor Planet Center
  139. Robin Mason, filmmaker
  140. Todd Mason, filmmaker
  141. Richard Massey, Astronomer
  142. Jake Maule, Arctic Mars Analogue Svalbard Expedition
  143. Dan McClese, Mars Reconnaissance Orbiter Mars Climate Sounder principal investigator
  144. Art McDonald, Director of the Sudbury Neutrino Observatory
  145. Alfred McEwen, Principal Investigator for HiRISE
  146. Lucy McFadden, Deep Impact Co-Investigator
  147. James McGaha, Amateur Astronomer
  148. Chris McKay, planetary scientist
  149. Bill McKinnon, planetary scientist
  150. Curtis Mead, Research Assistant, All-Sky Optical SETI
  151. Michael Meyer, Astronomer, University of Arizona
  152. Berrien Moore, Climate Central Executive Director
  153. Rafael Morozowski, Student Astronaut
  154. David Morrison, Interim Director, NASA's Lunar Science Institute
  155. Philip Morrison, Famed Physicist and SETI Pioneer
  156. Bruce Murray, Planetary Society founder
  157. Elon Musk, Founder of SpaceX
  158. Gerhard Neukum,
  159. Nichelle Nichols,
  160. Bill Nye, the Science Guy
  161. James Oberg, Writer and expert on international space programs
  162. Adriana Ocampo, Senior Scientist, European Space Agency
  163. Mike Okuda, graphic artist, Star Trek
  164. Steve Ostro, Radar Astronomer
  165. Toby Owen, Planetary Scientist
  166. Larry Page, Google co-founder
  167. Bob Pappalardo,
  168. Tim Parker, Jet Propulsion Laboratory
  169. Nicholas Patrick, NEEMO 13 Crew
  170. Robert Picardo, Actor and director
  171. Jeffrey Plaut, Jet Propulsion Laboratory
  172. Linda Purl, Actor
  173. Margaret Race, Ecologist
  174. Lisa Randall, Harvard physicist
  175. Marc Rayman, Deep Space 1 Project Manager
  176. John Rhys-Davies, Actor
  177. Sally Ride, First American Woman in Space
  178. Massimo Robberto, Astronomer
  179. Kim Robinson, Science Fiction Author
  180. Kim Stanley Robinson, Science Fiction Author
  181. Rod Roddenberry, writer
  182. Lawrence Rudnick, Astronomer
  183. John Rummel,
  184. Chris Russell, Dawn Principal Investigator
  185. Burt Rutan, SpaceShipOne
  186. Roald Sagdeev, former Director of the Soviet Space Research Institute
  187. Gerry Sanders, NASA's In Situ Resource Utilization Project
  188. Scott Sandford, Co-Investigator, Stardust
  189. Harrison Schmitt, geologist, engineer, entrepreneur and former US Senator
  190. Gerhard Schwehm, Rosetta Project Scientist
  191. Rusty Schweickart, Apollo 9 Astronaut
  192. Ben Shelef, Spaceward Foundation Co-founder
  193. Donna Shirley, Planetary Society Advisory Council
  194. Mark Showalter, planetary astronomer
  195. Peter Smith, Principal Investigator for Phoenix
  196. Dava Sobel, Author
  197. B. Thomas Soifer, Director of the Spitzer Science Center
  198. Claudio Sollazzo, Mission Operations Manager
  199. Sean Solomon, Principal Investigator for MESSENGER
  200. John Spencer, New Horizons science team member
  201. Linda Spilker, Cassini Deputy Project Scientist
  202. Tom Spilker, JPL Engineer
  203. Steve Squyres, Mars Exploration Rover Principal Investigator
  204. Andrew Stanton, WALL*E Creator
  205. Andrew Steele, Arctic Mars Analogue Svalbard Expedition
  206. Alan Stern, Principal Investigator, New Horizons mission to Pluto
  207. S. Alan Stern, Principal Investigator of New Horizons Mission to Pluto
  208. David Stevenson, Caltech planetary scientist
  209. Ellen Stofan, Cassini Radar Team
  210. Ed Stone, Voyager Interstellar Mission Chief Scientist
  211. Woody Sullivan, UW Astronomer
  212. Jessica Sunshine, spectroscopist and Deep Impact co-investigator
  213. Hakan Svedhem, Project Scientist for Venus Express
  214. Håkan Svedhem, Venus Express Project Scientist
  215. Mark Swain, Jet Propulsion Laboratory
  216. Mark Sykes, Director of the Planetary Science Institute
  217. Alex Tai, Vice President for Operations, Virgin Galactic
  218. Kenneth Tanaka, United States Geological Survey
  219. Stacy Tearne, Director of Communications, Space Adventures
  220. Robert Bruce Thompson, co-author, Illustrated Guide to Astronomical Wonders
  221. Tim Titus, planetary scientist
  222. Clyde Tombaugh, Pluto's discoverer
  223. Roy Tucker,
  224. Elizabeth Turtle, University of Arizona planetary geologist
  225. Slava Turyshev,
  226. Stephane Udry, Astronomer
  227. Jurrie van der Woude,
  228. John Vilja, Pratt and Whitney Rocketdyne's Program Manager
  229. Bettye Walker, Cofounder, A-Man International Science Discovery & Learning Center
  230. Hal Walker, Cofounder, A-Man International Science Discovery & Learning Center
  231. Steve Wall, Deputy Team Leader, Cassini RADAR
  232. David Warmflash, NASA Astrobiology Institute
  233. Edward Weiler, NASA Associate Administrator
  234. Dan Wertheimer, UC Berkeley SETI Chief Scientist
  235. Dan Werthimer, UC Berkeley SETI Chief Scientist
  236. Andrew Westphal, Stardust science team member
  237. Cheryl Wheeler, Singer, Songwriter
  238. Roger Wiens, Genesis team member
  239. Mark Wolverton, Author
  240. J. Judson Wynne, USGS Speleologist
  241. Don Yeomans, Manager of NASA's Near Earth Object Program Office
  242. John Young, Astronaut
  243. Alexander Zakharov, Russian Space Research Institute
  244. Rich Zurek, MRO Project Scientist