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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 the SETI@Home project
  12. John Anderson, JPL Senior Research Scientist
  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, 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,
  30. Bill Boynton, Lead Scientist, Phoenix TEGA
  31. Ray Bradbury,
  32. David Brin, Science Fiction Author
  33. Mike Brown, CalTech astronomer and discoverer of 2003 UB313 (Xena)
  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, Arizona State University planetary scientist
  45. Ben Clark, Lockheed Martin's Chief Scientist of Space Exploration
  46. Arthur C. Clarke,
  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, Science and Data Systems Coordinator
  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. 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, Executive Director of The Planetary Society
  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, Co-Director of Research for the Space Science Institute
  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. Jack Holt, University of Texas, Austin
  103. Paul Horowitz, Harvard Astrophysicist
  104. Robert Lee Hotz, a Pulitzer Prize-winning science writer for the Los Angeles Times
  105. Justin Houchin, a 17-year-old from Sunland, California, could be the first teenager in space
  106. Andrew Howard,
  107. Steve Howell, Astrophysicist
  108. Wes Huntress, Planetary Society President and Former NASA Associate Administrator
  109. Wendy Jaeger, planetary scientist
  110. Thomas Janka, Max Planck Institute for Astrophysics
  111. Torrence Johnson,
  112. Tom Jones, Astronaut
  113. Junichiro Kawaguchi, Hayabusa Project Manager
  114. Charles Kennel, Space Studies Board Chair
  115. Bettyann Kevles, Author
  116. Andrew Knoll, Harvard biologist and science team member for the Mars Rover project
  117. Charley Kohlhase, Engineer, Artist, Cassini Mission Designer
  118. Detlef Koschny, European Space Operations Centre
  119. Michael Krepon, Head of the Space Security Project
  120. Liz Kruesi, Astrophysics Graduate Student
  121. Emily Lakdawalla, Science and Technology Coordinator, The Planetary Society
  122. Yuval Landau,
  123. Jean-Pierre Lebreton, Huygens Mission Manager and Project Scientist
  124. Wayne Lee, Mars Exploration Rover Entry, Descent and Landing Chief Engineer
  125. Guillermo Lemarchand, Director of Southern SETI
  126. Mark Lemmon, Lead Scientist, Phoenix SSI
  127. Laurie Leshin, Principal Investigator for SCIM
  128. Joel Levine, Principal Investigator for ARES
  129. Chris Lewicki, Flight Director for the Mars Exploration Rover Missions
  130. Slava Linkin, Russian Federation Space Research Institute
  131. Alexis Livanos, Northrop Grumman Space Technology President
  132. Mario Livio, Space Telescope Science Institute
  133. Jon Lomberg, Visions of Mars Project Director
  134. Rosaly Lopes, JPL
  135. M. G. Lord, Author of Astro Turf
  136. Ralph Lorenz, planetary scientist
  137. Christophe Lovis, Geneva Observatory
  138. Rob Manning, Entry, Descent and Landing Development Manager for Spirit and Opportunity
  139. Geoff Marcy, UC Berkeley astronomer
  140. Brian Marsden, Retired Director of the IAU's Minor Planet Center
  141. Robin Mason, filmmaker
  142. Todd Mason, filmmaker
  143. Richard Massey, Astronomer
  144. Jake Maule, Arctic Mars Analogue Svalbard Expedition
  145. Dan McClese, Mars Reconnaissance Orbiter Mars Climate Sounder principal investigator
  146. Art McDonald, Director of the Sudbury Neutrino Observatory
  147. Alfred McEwen, Principal Investigator for HiRISE
  148. Lucy McFadden, Deep Impact Co-Investigator
  149. James McGaha, Amateur Astronomer
  150. Chris McKay,
  151. Bill McKinnon, planetary scientist
  152. Curtis Mead, Research Assistant, All-Sky Optical SETI
  153. Michael Meyer, Astronomer, University of Arizona
  154. Neil Milburn, Armadillo Aerospace vice president and co-founder
  155. Berrien Moore, Climate Central Executive Director
  156. Rafael Morozowski, Student Astronaut
  157. David Morrison, Interim Director, NASA's Lunar Science Institute
  158. Philip Morrison, Famed Physicist and SETI Pioneer
  159. Bruce Murray, Planetary Society founder
  160. Elon Musk, Founder of SpaceX
  161. Gerhard Neukum,
  162. Nichelle Nichols,
  163. Bill Nye, the Science Guy
  164. James Oberg, Writer and expert on international space programs
  165. Adriana Ocampo, Senior Scientist, European Space Agency
  166. Mike Okuda, graphic artist, Star Trek
  167. Steve Ostro, Radar Astronomer
  168. Toby Owen, Planetary Scientist
  169. Larry Page, Google co-founder
  170. Bob Pappalardo,
  171. Tim Parker, Jet Propulsion Laboratory
  172. Nicholas Patrick, NEEMO 13 Crew
  173. Robert Picardo, actor, Star Trek
  174. Carle Pieters, planetary scientist
  175. Jeffrey Plaut, Jet Propulsion Laboratory
  176. Linda Purl, Actor
  177. Margaret Race, Ecologist
  178. Lisa Randall, Harvard physicist
  179. Marc Rayman, Dawn Project System Engineer
  180. John Rhys-Davies,
  181. Sally Ride, First American Woman in Space
  182. Massimo Robberto, Astronomer
  183. Kim Robinson, Science Fiction Author
  184. Kim Stanley Robinson, Science Fiction Author
  185. Rod Roddenberry, writer
  186. Lawrence Rudnick, Astronomer
  187. John Rummel,
  188. Chris Russell, Dawn Principal Investigator
  189. Burt Rutan, SpaceShipOne
  190. Roald Sagdeev, former Director of the Soviet Space Research Institute
  191. Gerry Sanders, NASA's In Situ Resource Utilization Project
  192. Scott Sandford, Co-Investigator, Stardust
  193. Harrison Schmitt, geologist, engineer, entrepreneur and former US Senator
  194. Gerhard Schwehm, Rosetta Project Scientist
  195. Rusty Schweickart, B612 Foundation Chairman and Apollo 9 Astronaut
  196. Ben Shelef, Spaceward Foundation founder
  197. Donna Shirley, Planetary Society Advisory Council
  198. Mark Showalter, planetary astronomer
  199. Peter Smith, Principal Investigator for Phoenix
  200. Dava Sobel, Author
  201. B. Thomas Soifer, Director of the Spitzer Science Center
  202. Claudio Sollazzo, Mission Operations Manager
  203. Sean Solomon, Principal Investigator for MESSENGER
  204. John Spencer, Cassini Team Member
  205. Linda Spilker, Cassini Deputy Project Scientist
  206. Tom Spilker, JPL Engineer
  207. Steve Squyres, Principal Investigator for the Athena Science Payloads on the two Mars Exploration Rovers
  208. Andrew Stanton, WALL*E Creator
  209. Andrew Steele, Arctic Mars Analogue Svalbard Expedition
  210. Alan Stern, Principal Investigator, New Horizons
  211. S. Alan Stern, Principal Investigator of New Horizons Mission to Pluto
  212. David Stevenson, Caltech planetary scientist
  213. Ellen Stofan, Cassini Radar Team
  214. Ed Stone, Former Director of the Jet Propulsion Laboratory
  215. Woody Sullivan, UW Astronomer
  216. Jessica Sunshine, spectroscopist and Deep Impact co-investigator
  217. Hakan Svedhem, Project Scientist for Venus Express
  218. Håkan Svedhem, Venus Express Project Scientist
  219. Mark Swain, Jet Propulsion Laboratory
  220. Mark Sykes, Director of the Planetary Science Institute
  221. Alex Tai, Vice President for Operations, Virgin Galactic
  222. Kenneth Tanaka, United States Geological Survey
  223. Stacy Tearne, Director of Communications, Space Adventures
  224. Robert Bruce Thompson, co-author, Illustrated Guide to Astronomical Wonders
  225. Tim Titus, planetary scientist
  226. Clyde Tombaugh, Pluto's discoverer
  227. Roy Tucker,
  228. Elizabeth Turtle, University of Arizona planetary geologist
  229. Slava Turyshev, JPL Research Scientist
  230. Stephane Udry, Astronomer
  231. Jurrie van der Woude,
  232. John Vilja, Pratt and Whitney Rocketdyne's Program Manager
  233. Bettye Walker, Cofounder, A-Man International Science Discovery & Learning Center
  234. Hal Walker, Cofounder, A-Man International Science Discovery & Learning Center
  235. Steve Wall, Deputy Team Leader, Cassini RADAR
  236. David Warmflash, NASA Astrobiology Institute
  237. Edward Weiler, NASA Associate Administrator
  238. Dan Wertheimer, SETI Scientist
  239. Dan Werthimer, UC Berkeley SETI Chief Scientist
  240. Andrew Westphal, U.C. Berkeley, Stardust@home Project Director
  241. Cheryl Wheeler, Singer, Songwriter
  242. Roger Wiens, Genesis team member
  243. Mark Wolverton, Author
  244. J. Judson Wynne, USGS Speleologist
  245. Don Yeomans, Manager of NASA's Near Earth Object Program Office
  246. John Young, Astronaut
  247. Alexander Zakharov, Russian Space Research Institute
  248. Rich Zurek, MRO Project Scientist