| Date | Last Name | First Name | Title(s) | Organization | Topic/Title |
| 10/08/98 | Coyne | George V. | Fr., S.J., Director | Vatican Obervatory | To See Ourselves as the Universe Does: Our Place in an Evolving Cosmos |
| 11/09/98 | Lindahl | James B. | Dr. | SCVAC | Understanding the Starry Sky |
| 12/14/98 | Chorney | Paul | Dr. | SCVAC | A Tour of the Planets and Moons |
| 01/28/99 | Foltz | Craig | Dr., Director | Whipple Observatory | The Multiple Mirror Telescope Observatory |
| 02/25/99 | Levy | David | Dr. | Jarnac Observatory | More Things in Heaven and Earth |
| 03/25/99 | Coyne | George V. | Fr., S.J., Director | Vatican Obervatory | The Birth and Death of the Stars and Planets |
| 10/07/99 | Lunine | Jonathan | Prof. | LPL, UA | The Cassini Mission and the Exploration of New Worlds |
| 11/04/99 | Walker | Chris | Prof. | Astronomy Dept., UA | Radio Astronomy from the South Pole |
| 12/21/99 | Lindahl | James B. | Dr. | SCVAC | Understanding the Starry Sky |
| 02/03/00 | Yingst | Aileen | Dr. | LPL, UA | Latest Results from the Mars Polar Lander |
| 03/02/00 | Corbally | Chris | Fr., S.J. | Vatican Obervatory | The Lives and Personalities of Stars |
| 04/06/00 | Fleming | Thomas | Prof. | Astronomy Dept., UA | The Chandra Orbiting X-Ray Observatory |
| 05/04/00 | Pilachowski | Catherine A. | Dr. | NOAO | Telescopes 2000: The Next Generation |
| 10/05/00 | Consolmagno | Guy | Br. | Vatican Obervatory | Visitors from Another Planet: Searching for Meteorites in Antarctica |
| 11/02/00 | Hill | Frank | Dr. | NOAO | The Sun From The Inside Out |
| 01/04/01 | Terenzoni | Michael | Flandrau Science Center | Tips for the Amateur Astronomer on Optical Instruments and Sky Observation | |
| 03/01/01 | Steinmetz | Matthias | Prof. | Astronomy Dept., UA | Cosmology 101 |
| 04/15/01 | Bopp | Thomas | Dr. | The Discovery of the Comet Hale-Bopp | |
| 05/03/01 | Geissler | Paul | Dr. | LPL, UA | Galileo: The Long Road to Jupiter |
| 10/18/01 | Block | Adam | NOAO | Dances with Lx 200s | |
| 11/15/01 | Consolmagno | Guy | Br. | Vatican Obervatory | News from the Asteroid Belt |
| 01/17/02 | Mangum | Jeff | Dr. | NRAO | The Universe through Radio Eyes |
| 02/21/02 | Code | Arthur | Dr. | NOAO | The Hubble Space Telescope: Window to the Universe |
| 03/21/02 | Kring | David | Dr. | LPL, UA | The Chicxulub Meteor Impact |
| 04/18/02 | D'Addario | Larry | NRAO | SETI: The Search for Extraterrestrial Intelligence | |
| 05/16/02 | Pacholczyk | A.G. | Prof. | Astronomy Dept., UA | Our Changing Views of the Universe |
| 10/18/02 | Bradshaw | Michael | Dr. | Astronomy Dept., UA | Super-Intense Gamma-Ray Bursts from Space |
| 11/21/02 | Drake | Michael | Prof., Director | LPL, UA | The Origin of the Moon |
| 12/19/02 | Holberg | Jay | Prof. | Astronomy Dept., UA | Red Dogs, White Dwarfs and Dark Stars: A Tale of Sirius through the Ages |
| 01/16/03 | Stoeger | William | Fr. | Vatican Obervatory | Cosmology: The Origin, Development and Destiny of the Universe |
| 02/20/03 | Lunine | Jonathan | Prof. | LPL, UA | Next Generation Space Telescope and What It Can Do in the Search for Planets |
| 03/20/03 | Eisenstein | Daniel | Prof. | Astronomy Dept., UA | The Sloan Digital Sky Survey |
| 04/17/03 | Smith | Peter | Dr. | LPL, UA | The Phoenix Mission to Mars |
| 05/15/03 | Wehinger | Peter | Dr. | Astronomy Dept., UA | Work in Progress – MMT, LBT and Magellan |
| 10/16/03 | Funes | Jose | Fr., S.J. | Vatican Obervatory | Galaxies in Our Backyard |
| 11/20/03 | McMillan | Robert | Dr. | LPL, UA | The Spacewatch Survey for Hazardous Asteroids |
| 12/18/03 | Faix | Louis | Mr. | Amateur Astronomer & Retired Engineering Executive | The Star of Bethlehem: What Was It Really? |
| 01/15/04 | Corbally | Chris | Fr., S.J. | Vatican Obervatory | Getting to Know Thy Neighbors |
| 02/19/04 | Levy | David | Dr. | Jarnac Observatory | Searching for Comets: A Night Watchman's Journey |
| 03/18/04 | Lombardi | Doug | Mgr, Education & Public Outreach | LPL, UA | Imager for Mars Pathfinder |
| 04/15/04 | Hill | Frank | Dr. | NOAO | Space Weather |
| 05/20/04 | Lunine | Jonathan | Dr. | LPL, UA | Update -- the Cassini Mission |
| 10/21/04 | Swindle | Timothy | Dr. | LPL, UA | Life in a Martian Meteorite? |
| 11/18/04 | Weekes | Trevor | Dr. | Harvard-Smithsonian Center for Astrophysics | Extreme Astronomy (An overview of Project VERITAS — Very Energetic Radiation Imaging Telescope Array System) |
| 12/16/04 | Faix | Louis | Mr. | Amateur Astronomer & Retired Engineering Executive | Binary Stars (A description of the behavior of binary stars; how to observe them and measure them as an amateur astronomer.) |
| 01/20/05 | Coyne | George V. | Fr., S.J., Director | Vatican Obervatory | The Dance of the Fertile Universe: Chance and Necessity Embrace |
| 02/17/05 | Lorenz | Ralph D. | Dr. | LPL, UA | Lifting Titan's Veil |
| 03/17/05 | McCarthy | Donald | Dr. | Astronomy Dept., UA | Is Pluto a Planet? |
| 04/21/05 | Kring | David | Dr. | LPL, UA | The Environmental Effects of the Chicxulub Impact Event and the Demise of Dinosaurs |
| 05/19/05 | Funes | Jose | Fr., S.J. | Vatican Obervatory | Monsters, Inc.: Supermassive Black Holes |
| 10/20/05 | Holdaway | Mark | Dr. | NRAO | ALMA: A New Telescope Opening the Window to the Cool Universe |
| 11/17/05 | Pinto | Philip | Associate Prof. | Astronomy Dept., UA | The Large Synoptic Survey Telescope and Celestial Cinematography |
| 12/15/06 | Stoeger | William | Fr., S.J. | Vatican Obervatory | Cosmological Mysteries -- Evidence for the Unseen: Dark Matter and Dark Energy |
| 01/19/06 | Sweeney | Donald | Project Manager | LSST | The LSST – By Far the World’s Largest Survey Telescope |
| 03/16/06 | Holberg | Jay | Prof. | LPL, UA | Distant Suns |
| 04/20/06 | McCarthy | Donald | Dr. | Astronomy Dept., UA | Searches for Other Planetary Systems |
| 05/18/06 | Smith | Peter | Dr. | LPL, UA | Phoenix Mars Scout Mission |
| 10/19/06 | Greenberg | Richard | Dr. | LPL, UA | Europa, the Ocean Moon: The Search for an Alien Biosphere |
| 11/16/06 | Woolf | Neville | Prof. | Astronomy Dept., UA | Life: What Is It and How Did It Start? |
| 12/21/06 | Faix | Louis | Mr. | Amateur Astronomer & Retired Engineering Executive | The Star of Bethlehem: What Was It Really? |
| 01/18/07 | Lunine | Jonathan | Prof. | LPL, UA | Cassini and The Lakes of Titan |
| 02/15/07 | Williams | G. Grant | Dr. | MMTO | The New MMT: Technical Developments and Scientific Discoveries |
| 03/15/07 | McMillan | Robert S. | Dr. | LPL, UA | Spacewatch Preparations for the Era of Deep All-Sky Surveys |
| 04/19/07 | Fountain | John | Mr. | Researcher | Archaeoastronomy |
| 05/17/07 | Vilas | Faith | Dr. | MMTO | Probing Near-Earth Asteroid Characteristics: The Japanese Hayabusa Mission to Asteroid 25143 Itokawa |
| 10/18/07 | Zabludoff | Ann | Prof. | Astronomy Dept., UA | A Stroll through our Extragalactic Neighborhood |
| 11/15/07 | Corbally | Chris | Fr. | Vatican Obervatory | M's the Word: Secrets of Cool Stars |
| 12/20/07 | Faix | Louis | Mr. | Amateur Astronomer & Retired Engineering Executive | Twinkle, twinkle little star--how I wonder WHAT you are |
| 01/17/08 | Hill | Frank | Dr. | NOAO | The Magnetic Sun |
| 02/21/08 | Eisenstein | Daniel | Assoc. Prof. | Astronomy Dept., UA | Dark Energy and Cosmic Sound |
| 03/20/08 | Drake | Michael | Prof., Director | LPL, UA | Recent UA Activities in Planetary Exploration |
| 04/17/08 | Wehinger | Peter | Dr. | Astronomy Dept., UA | Large Telescopes - Work in Progress |
| 05/15/08 | Rieke | George | Prof. | Astronomy Dept., UA | Extra-solar Planetary Debris |
| 10/16/08 | Hill | John M. | Dr., Technical Director | Large Binocular Telescope Observatory | The Large Binocular Telescope: Really a Binocular Now |
| 11/20/08 | Coyne | George M. | Fr., S.J., Foundation Director | Vatican Obervatory | Determining the Age of the Universe |
| 12/18/08 | Faix | Louis | Mr. | Amateur Astronomer & Retired Engineering Executive | Nebulae - The Alpha and Omega of Nature's Creation |
| 01/15/09 | Meyer | Michael | Prof. | Astronomy Dept., UA | When Worlds Collide: The Formation and Evolution of Planetary Systems |
| 02/19/09 | Strom | Robert | Prof. Emeritus | LPL, UA | Exploring Mercury: The Iron Planet |
| 03/19/09 | Baker | Victor | Regents Prof. | LPL, UA | Mega Floods on Earth and Mars |
| 04/16/09 | Pompea | Stephen | Scientist and Manager of Science Education | National Optical Astronomy Observatory | From Galileo's Telescope to the Galilescope: 400 Years of Astronomy |
| 05/21/09 | Krabbendam | Victor | LSST Telescope and Site Project Manager | LSST Corporation | The LSST: A wide, fast, and deep, survey for the astrophysicist in all of us |
| 10/15/09 | Bray | Veronica | Post Doctoral Research Associate | LPL, UA | Small Steps and Giant Leaps -- Man's Journey to the Moon and Mars |
| 11/19/09 | Woida | Patrick | Dr. | LPL, UA | Somewhere, something incredible is waiting to be known -- the Adventure of the Phoenix Mars Mission |