| October 1 | ||
| October 8 | Tom Duvall (NASA Goddard/Stanford) Helioseismology Results from the SOHO Satellite |
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| October 15 | Leo Blitz (U.C.Berkeley) What the High Velocity Clouds Are | |
| October 22 | Dale Frail (NRAO) Shock-Excited Maser Emission Toward Supernova Remnants |
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| October 29 | Jean Swank (NASA/Goddard The Results of the Rossi XTE Explorer |
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| November 5 | Daniela Calzetti (STScI) Dust and Star Formation in UV-Bright Galaxies | |
| November 12 | Jeremy Mould (Australia) The Star Formation History of Galaxies Near Us | |
| November 19 | Ed Turner (Princeton) Gravitational Lenses and the Age of the Universe | |
| November 26 | David Schlegel (Univ. of Durham (England)) Galactic Cataracts: An Optician's Cure |
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| December 3 | Claire Max (Livermore) Adaptive Optics and Laser Guide Stars for Astronomy |
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| December 10 | Bo Reipurth (Germany) Herbig-Haro Jets and their Energy Sources |
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| January 7, 1998 | Lynne Hillenbrand (Caltech) Star Formation in the Orion Nebula Cluster |
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| January 14, 1998 | Bob Kirshner (Harvard) Measuring H_o and Omega with High Redshift Supernovae |
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| January 21, 1998 | Reinhard Genzel (Germany) The Galactic Center Black Hole |
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| January 28, 1998 | Chris Clemens (Caltech) Observational Approaches to Stellar Interior Physics |
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| February 4, 1998 | Frank Shu (Berkeley) Protostellar Winds and Jets |
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| February 11, 1998 | 'Uros Seljak (CFA) Cosmology with Cosmic Microwave Background Anisotropies |
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| February 18, 1998 | Michael Rauch (Caltech) QSO Absorption Lines and the Signature of High Redshift Galaxy Formation |
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| February 25, 1998 | George Helou (IPAC) Star Formation in Galaxies: the News from ISO |
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| March 4, 1998 | Marcia Rieke (U. of Arizona) NICMOS Views the Galactic Center |
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| March 11, 1998 | Fred Hamann (U.C. San Diego) (rescheduled to April 8) |
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| March 18, 1998 | Simon Lilly (Toronto, Canada) The Evolving Galaxy Population |
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| April 1, 1998 | Steve Myers (University of Pennsylvania) Cosmic Paleontology: Baryons and Dark Matter in the Fossil Record of the CMB |
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| April 8, 1998 | Fred Hamann (U.C. San Diego) The Physics and Evolution of Quasar Environments |
Dimitar Sasselov (CFA) (Cancelled) |
| April 15, 1998 | Roc Cutri (IPAC) The 2-Micron All-Sky Survey (2MASS): Status and Early Results |
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| April 22, 1998 | Esther Hu (University of Hawaii) Lighting Up the Dark Ages with High Redshift Lyman Alpha Emitting Galaxies |
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| April 29, 1998 | Pat Thaddeus (Harvard) Twenty Eight New Carbon Chains Molecules." |
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| May 6, 1998 | Pat McCarthy (Santa Barbara Street) NICMOS Observations of Faint and Distant Galaxies |
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| May 13, 1998 | Phil Goode (NJIT) The Sun From Big Bear |
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| May 20, 1998 | Carme Gallart (Santa Barbara Street) Star formation in Local Group dSph Galaxies. How much and When ? |
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| May 27, 1998 | Alan Dressler (Santa Barbara Street) Surface-Brightness-Fluctuation Distances to Galaxies: Large-scale Flows and the Great Attractor |
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