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Watson Lecture: When Earth Breathed Deeply

Wednesday, January 18, 2023
7:30pm to 8:30pm
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Online and In-Person Event
Claire E. Bucholz, Assistant Professor of Geology; Biedebach Memorial Lecturer, Division of Geological and Planetary Sciences,
  • Public Event

Earth's climate has not been constant throughout history. Oxygen levels in the atmosphere, for example, have increased by many orders of magnitude over time, profoundly affecting biologic and chemical cycles at the surface of the earth.These changes in Earth's climate can be traced through the imprints left behind inside the planet. In this lecture, Bucholz will explore how such shifts in atmospheric oxygen concentrations altered Earth's inner workings.

This lecture will be presented in a hybrid format, allowing for both virtual viewers and in-person attendees. No advance registration is required for either format but you may sign up for reminders for this event.

How to watch online
The lecture can be viewed via live stream on or on Caltech's YouTube channel. Virtual viewers can submit questions for the lecturer through the YouTube chat feed. Select questions will be answered after the lecture, during the audience Q&A.

How to attend in person
Local participants can attend the lecture inside Caltech's Beckman Auditorium. Doors open at 7:00p.m. By entering the auditorium, attendees attest to being fully vaccinated or having a legal medical exemption. Masks are optional inside Beckman Auditorium. In-person attendees can ask questions during the audience Q&A immediately following the program.

About the Series
The 2022–2023 season marks the centennial of The Earnest C. Watson Lecture Series, which has brought Caltech's most innovative scientific research to the public since the Friday Evening Demonstrations premiered in October of 1922. The series is named for Earnest C. Watson, a professor of physics at Caltech from 1919 until 1959. The Watson Lectures are geared toward a general audience, as part of the Institute's ongoing commitment to benefiting the local community through education and outreach. All Watson lectures are free and open to the public.

Many past Watson Lectures are available on YouTube.

For more information, please contact The Caltech Ticket Office by email at [email protected].