100th Anniversary of the Shapley – Curtis Great Debate

1920: Scale of the Universe Debate 
History & brief summaries: About the 1920 Greate Debate | Wikipedia | This Month in Astronomical History | Astronomy's Great Remembrance
Virginia Trimble: History of the Scale of the Universe Debate
Deborah Shapley (Granddaughter): Harlow Shapley: Discovering Our Place in the Galaxy | harlowshapley.com
Sarah & Robert Curtis (Great-great Granddaughter & Great-Grandson): The Family Legacy of Heber Doust Curtis

2020: Life in the Universe Debate 
Jill Tarter (SETI Institute): Overview: Here and Now: A Century Later
Glossary: Frequently used terms
Introduction: The Life in the Universe Debate in 2020

Debate Question: How will humanity first discover extraterrestrial life? 

Jessie Christiansen (Scientist: NASA Exoplanet Inst.)
Charles Cockell (Prof. of Astrobiology: U. Edinburgh)
Guy Consolmagno (Director: Vatican Observatory)
Richard Tresch Fienberg (AAS, Sky & Telescope)
Timothy Ferris (Author, Producer: PBS: Life Beyond Earth)
Robert Gendler (Author: A Year in the Life of the Universe)
James Green (Chief Scientist: NASA) 
David Grinspoon (Senior Scientist: Planetary Science Institute)
Paul Hertz (Director of Astrophysics: NASA)
Sabine Hossenfelder (Frankfurt IAS, Backreaction Blog)
Stephen Maran (AAS Press Officer: 1984-2009)
John Mather (NASA, Nobel Prize in Physics 2006)
Robert Nemiroff (Prof: Michigan Tech; PI: APOD)
Martin Rees (Cambridge U., Astronomer Royal UK) 
Caleb Scharf (Columbia U., Director of Astrobiology)
Sara Seager (Prof. of Planetary Science, MIT)
Seth Shostak (Senior Astronomer: SETI Institute)
Ethan Siegel (Starts with a Bang Blog)
David Spergel (Princeton U., Flatiron Ins.)
Jill Tarter (SETI Institute)
Peter Ward (Professor: U. Washington)

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