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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. Bill Ailor, Director of the Aerospace Corporation's Center for Orbital and Reentry Debris Studies
  5. Buzz Aldrin,
  6. Amir Alexander, Writer and Editor for planetary.org
  7. Claudia Alexander, Galileo Project Manager
  8. Carlton Allen, Curator, Johnson Space Center Astromaterials Lab
  9. Mark Allen, Principal Investigator for MARVEL
  10. Bob Anderson,
  11. Clay Anderson, Astronaut
  12. David Anderson, Director, SETI@Home
  13. John Anderson, JPL Senior Research Scientist
  14. Nigel Angold, Ulysses Mission Operations Manager
  15. Heather Archuletta, NASA experimental test subject
  16. Richard Arnold, NEEMO 13 Crew
  17. Sami Asmar, Manager of the Radio Science Group at the Jet Propulsion Laboratory
  18. Tim Bailey, space activist
  19. Kevin Baines, planetary scientist
  20. Bruce Banerdt, MER Project Scientist
  21. Donald Banfield, Cornell planetary scientist
  22. Reta Beebe, Astronomer
  23. Jim Bell, Payload Element Lead for the Pancam instruments on the Mars Exploration Rovers
  24. Greg Benford,
  25. Jim Benford,
  26. Bob Benjamin, Research Scientists
  27. Steve Benner, Foundation for Applied Molecular Evolution
  28. Bruce Betts, Director of Projects, The Planetary Society
  29. Alan Binder, Principal Investigator for Lunar Prospector
  30. Peter Birtwhistle, Amateur Astronomer
  31. Bill Blair, Astrophysicist
  32. Scott Bolton, Principal Investigator for JUNO
  33. Andre Bormanis,
  34. William Borucki, Kepler Science Principal Investigator
  35. Bill Boynton, Lead Scientist, Phoenix TEGA
  36. Ray Bradbury,
  37. David Brin, Science Fiction Author
  38. Mike Brown, CalTech Planetary Astronomer
  39. Don Brownlee, Stardust Principal Investigator
  40. Roger Buick, Professor, University of Washington
  41. James D. Burke, Technical Editor of The Planetary Report
  42. Don Burnett, Genesis mission principal investigator and lead scientist
  43. John Callas, Mars Exploration Rover Project Manager
  44. James Cameron, Director, Producer, Writer
  45. John Casani, Prometheus Project Manager
  46. Robert Cassanova, Director of the NASA Institute for Advanced Concepts
  47. Andrew Chaikin, Author
  48. David Charbonneau, Harvard Astronomer
  49. Neil Cheatwood, Principal Investigator
  50. Phil Christensen, TES and THEMIS Principal Investigator
  51. Ben Clark, Lockheed Martin's Chief Scientist of Space Exploration
  52. Arthur C. Clarke, Author
  53. Geoffrey Collins, Planetary Scientist
  54. Joy Crisp, Project Scientist for the Mars Exploration Rover mission
  55. Glen Cushing, planetary scientist
  56. Shana Dale, NASA Deputy Administrator
  57. Thomas Dame, Radio Astronomer
  58. Matt Dawson,
  59. Imke de Pater, Astronomer
  60. Neil deGrasse Tyson, Director of the Hayden Planetarium in New York
  61. John Delaney, Oceanographer
  62. Greg Delory, Mars Microphone Developer
  63. Tilmann Denk, Free University of Berlin
  64. Peter Diamandis, Chairman, X Prize Foundation
  65. Don Dixon, Space Artist
  66. Courtney Dressing, Student Astronaut
  67. Ann Druyan,
  68. Dan Durda, Near Earth Object astronomer and astronomical painter
  69. Tom Duxbury, Jet Propulsion Laboratory
  70. Freeman Dyson,
  71. Ken Edgett, Malin Space Science Systems
  72. Charles Elachi, Jet Propulsion Laboratory Director
  73. Annmarie Eldering, Deputy Manager of JPL's Earth Atmospheric Science Section
  74. Richard Ellis, Professor of Astronomy at the California Institute of Technology
  75. Doug Ellison, blogger and founder of unmannedspaceflight.com
  76. Jim Erickson, Mars Exploration Rover Project Manager
  77. Wolfgang Fink, CalTech physicist/robotocist
  78. Debra Fischer, Astronomer
  79. Bernard Foing, Project Scientist for SMART-1
  80. Jonathan Frakes, Director of Thunderbirds
  81. Louis Friedman, Executive Director, The Planetary Society
  82. Satoshi Furukawa, NEEMO 13 Crew
  83. Owen Garriott,
  84. Lori Garver, Former Associate Administrator for Policy and Plans at NASA
  85. James Garvin, NASA's Chief Scientist
  86. Neil Gehrels, Principal Investigator for Swift
  87. Mark Gittelman, Vice President and General Manager, Oceaneering Space Systems
  88. Walter Goetz, Mars Exploration Rovers magnet team member from the University of Copenhagen
  89. Dan Goldin,
  90. Barry Goldstein, Project Manager for Phoenix
  91. Matt Golombek, Co-chair, Mars Exploration Rover Landing Site
  92. Jim Graf, MRO Project Manager
  93. Douglas Graham, XCOR Aerospace
  94. Stephen Grasby, Geologic Survey of Canada
  95. Jeff Greason, CEO, XCOR Aerospace
  96. Jack Gregg, Head, California Space Education & Workforce Institute
  97. Michael Griffin, NASA Administrator
  98. Mike Griffin, NASA Administrator
  99. Albert Haldemann, Deputy Project Scientist for the Mars Exploration Rover mission
  100. Howard Hall, Under the Sea 3D
  101. Michelle Hall, Under the Sea 3D
  102. Heidi Hammel, planetary scientist and Planetary Society Board member
  103. Joe Harrington, Spitzer Space Telescope team member
  104. Alan Harris, one of many scientists working to protect our little planet from Near Earth Objects
  105. William Hartmann, Planetary scientist, author, and artist
  106. Ken Herkenhoff, Lead Scientist for the Mars Exploration Rover's Microscopic Imager
  107. Homer Hickam, Author and Former NASA Engineer
  108. Paul Hill,
  109. Victoria Hipkin, Lead Scientist, Phoenix MET
  110. Jeff Hoffman, Astronaut
  111. Mark Hofstadter, Jet Propulsion Laboratory
  112. Robert Holmes, Shoemaker NEO Grant recipient
  113. Jack Holt, University of Texas, Austin
  114. Paul Horowitz, Harvard Astrophysicist
  115. Robert Lee Hotz, a Pulitzer Prize-winning science writer for the Los Angeles Times
  116. Justin Houchin, a 17-year-old from Sunland, California, could be the first teenager in space
  117. Andrew Howard,
  118. Steve Howell, Astrophysicist
  119. Steve Hughes, IRVE Lead Engineer
  120. Wes Huntress, Planetary Society President and Former NASA Associate Administrator
  121. Wendy Jaeger, planetary scientist
  122. Thomas Janka, Max Planck Institute for Astrophysics
  123. Torrence Johnson,
  124. Tom Jones, Astronaut
  125. Mat Kaplan, Producer and Host, Planetary Radio
  126. Junichiro Kawaguchi, Hayabusa Project Manager
  127. Charles Kennel, Space Studies Board Chair
  128. Bettyann Kevles, Author
  129. Andrew Knoll, Harvard biologist and science team member for the Mars Rover project
  130. Charley Kohlhase, Engineer, Artist, Cassini Mission Designer
  131. Detlef Koschny, European Space Operations Centre
  132. Michael Krepon, Head of the Space Security Project
  133. Liz Kruesi, Astrophysics Graduate Student
  134. Emily Lakdawalla, Science and Technology Coordinator, The Planetary Society
  135. Yuval Landau,
  136. Lonne Lane, Jet Propulsion Laboratory
  137. Jean-Pierre Lebreton, Huygens Mission Manager and Project Scientist
  138. Wayne Lee, Mars Exploration Rover Entry, Descent and Landing Chief Engineer
  139. Guillermo Lemarchand, Director of Southern SETI
  140. Mark Lemmon, Lead Scientist, Phoenix SSI
  141. Laurie Leshin, Principal Investigator for SCIM
  142. Joel Levine, Principal Investigator for ARES
  143. Chris Lewicki, Flight Director for the Mars Exploration Rover Missions
  144. Slava Linkin, Russian Federation Space Research Institute
  145. Alexis Livanos, Northrop Grumman Space Technology President
  146. Mario Livio, Space Telescope Science Institute
  147. Daniel Lockney, Editor NASA's Annual Spinoff Report
  148. Jon Lomberg, Visions of Mars Project Director
  149. Rosaly Lopes,
  150. M. G. Lord, Author of Astro Turf
  151. Ralph Lorenz, planetary scientist
  152. Christophe Lovis, Geneva Observatory
  153. Rob Manning, Entry, Descent and Landing Development Manager for Spirit and Opportunity
  154. Geoff Marcy, UC Berkeley astronomer
  155. Brian Marsden, Retired Director of the IAU's Minor Planet Center
  156. Robin Mason, filmmaker
  157. Todd Mason, filmmaker
  158. Richard Massey, Astronomer
  159. Jake Maule, Arctic Mars Analogue Svalbard Expedition
  160. Hal McAlister, Director, Mt. Wilson Institute
  161. Dan McClese, Mars Reconnaissance Orbiter Mars Climate Sounder principal investigator
  162. Art McDonald, Director of the Sudbury Neutrino Observatory
  163. Alfred McEwen, Principal Investigator for HiRISE
  164. Lucy McFadden, Deep Impact Co-Investigator
  165. James McGaha, Amateur Astronomer
  166. Chris McKay, Planetary Scientist
  167. Bill McKinnon, planetary scientist
  168. Curtis Mead, Research Assistant, All-Sky Optical SETI
  169. Abel Mendez, Associate Professor, University of Puerto Rico at Arecibo
  170. Michael Meyer, Chief Scientist, NASA Mars Exploration Program
  171. Neil Milburn, Armadillo Aerospace vice president and co-founder
  172. Berrien Moore, Climate Central Executive Director
  173. Rafael Morozowski, Student Astronaut
  174. David Morrison, Interim Director of the Lunar Science Institute
  175. Philip Morrison, Famed Physicist and SETI Pioneer
  176. Michael Mumma, Director, Goddard Center for Astrobiology
  177. Bruce Murray, Planetary Society co-founder
  178. Elon Musk, Founder of SpaceX
  179. Gerhard Neukum,
  180. Nichelle Nichols,
  181. Bill Nye,
  182. James Oberg, Writer and expert on international space programs
  183. Adriana Ocampo, Senior Scientist, European Space Agency
  184. Mike Okuda, graphic artist, Star Trek
  185. Steve Ostro, Radar Astronomer
  186. Toby Owen, Planetary Scientist
  187. Larry Page, Google co-founder
  188. Bob Pappalardo,
  189. Tim Parker, Jet Propulsion Laboratory
  190. Nicholas Patrick, NEEMO 13 Crew
  191. Robert Picardo, Actor and director
  192. Carle Pieters, planetary scientist
  193. Jeffrey Plaut, Jet Propulsion Laboratory
  194. Linda Purl, Actor
  195. Margaret Race, Ecologist
  196. Lisa Randall, Harvard physicist
  197. Marc Rayman, Deep Space 1 Project Manager
  198. Nilton Renno, University of Michigan
  199. John Rhys-Davies,
  200. Sally Ride, First American Woman in Space
  201. Massimo Robberto, Astronomer
  202. Kim Robinson, Science Fiction Author
  203. Kim Stanley Robinson, Science Fiction Author
  204. Rod Roddenberry, writer
  205. Lawrence Rudnick, Astronomer
  206. John Rummel,
  207. Chris Russell, Dawn Principal Investigator
  208. Burt Rutan, SpaceShipOne
  209. Roald Sagdeev, former Director of the Soviet Space Research Institute
  210. Gerry Sanders, NASA's In Situ Resource Utilization Project
  211. Scott Sandford, Co-Investigator, Stardust
  212. Harrison Schmitt, geologist, engineer, entrepreneur and former US Senator
  213. Gerhard Schwehm, Rosetta Project Scientist
  214. Rusty Schweickart, B612 Foundation Chairman and Apollo 9 Astronaut
  215. Ben Shelef, Spaceward Foundation founder
  216. Donna Shirley, Planetary Society Advisory Council
  217. Mark Showalter, planetary astronomer
  218. Mike Simmons, Co-chair, 100 Hours of Astronomy
  219. Peter Smith, Principal Investigator for Phoenix
  220. Dava Sobel, Author
  221. B. Thomas Soifer, Director of the Spitzer Science Center
  222. Claudio Sollazzo, Mission Operations Manager
  223. Sean Solomon, Principal Investigator for MESSENGER
  224. John Spencer, New Horizons science team member
  225. Linda Spilker, Cassini Deputy Project Scientist
  226. Tom Spilker, JPL Engineer
  227. Steve Squyres, Principal Investigator for the Athena Science Payloads on the two Mars Exploration Rovers
  228. Andrew Stanton, WALL*E Creator
  229. Andrew Steele, Arctic Mars Analogue Svalbard Expedition
  230. Alan Stern, Principal Investigator, New Horizons
  231. S. Alan Stern, Principal Investigator of New Horizons Mission to Pluto
  232. David Stevenson, Caltech planetary scientist
  233. Ellen Stofan, Cassini Radar Team
  234. Ed Stone, Former Director of the Jet Propulsion Laboratory
  235. Woody Sullivan, UW Astronomer
  236. Jessica Sunshine, spectroscopist and Deep Impact co-investigator
  237. Hakan Svedhem, Project Scientist for Venus Express
  238. Håkan Svedhem, Venus Express Project Scientist
  239. Mark Swain, Jet Propulsion Laboratory
  240. Mark Sykes, Director of the Planetary Science Institute
  241. Alex Tai, Vice President for Operations, Virgin Galactic
  242. Kenneth Tanaka, United States Geological Survey
  243. Stacy Tearne, Director of Communications, Space Adventures
  244. Robert Bruce Thompson, co-author, Illustrated Guide to Astronomical Wonders
  245. Tim Titus, planetary scientist
  246. Clyde Tombaugh, Pluto's discoverer
  247. Roy Tucker,
  248. Elizabeth Turtle, University of Arizona planetary geologist
  249. Slava Turyshev, JPL Research Scientist
  250. Stephane Udry, Astronomer
  251. Jurrie van der Woude,
  252. John Vilja, Pratt and Whitney Rocketdyne's Program Manager
  253. Richard Vondrak, Lunar Reconnaissance Orbiter Project Scientist
  254. Bettye Walker, Cofounder, A-Man International Science Discovery & Learning Center
  255. Hal Walker, Cofounder, A-Man International Science Discovery & Learning Center
  256. Steve Wall, Deputy Team Leader, Cassini RADAR
  257. David Warmflash, NASA Astrobiology Institute
  258. Edward Weiler, NASA Associate Administrator
  259. Dan Wertheimer, SETI Scientist
  260. Dan Werthimer, UC Berkeley SETI Chief Scientist
  261. Andrew Westphal, Stardust science team member
  262. Cheryl Wheeler, Singer, Songwriter
  263. Roger Wiens, Genesis team member
  264. Mark Wolverton, Author
  265. Beth Wusk, IRVE Project Manager
  266. J. Judson Wynne, USGS Speleologist
  267. Don Yeomans, Manager of NASA's Near Earth Object Program Office
  268. John Young, Astronaut
  269. Alexander Zakharov, Russian Space Research Institute
  270. Robert Zubrin, author and founder of The Mars Society
  271. Rich Zurek, MRO Project Scientist