The Planetary Science section shares the Carl Sagan Lecture with the Biogeosciences section, alternating years for selection. The Carl Sagan Lecture is presented annually and recognizes a scientist who embodies Carl Sagan’s interest in astrobiology, as well as his effective science communication skills. This lecture honors the life of Carl Sagan, an astronomer and astrophysicist who was a leader in establishing the field of astrobiology. Sagan was also a tireless educator, author, and advocate for the space sciences. The Carl Sagan Lecture does not have a formal nomination process, but a brief letter of nomination and a CV for the candidate should be submitted to the selecting section president.