Public Lecture by Andrea Ghez

October 25, 2021

IPAM Public Lecture

Green Family Lecture: “From the Possibility to the Certainty of a Supermassive Black Hole” by Dr. Andrea M. Ghez

Thank you for joining us for this special event. We hope you enjoyed Dr. Andrea M. Ghez’s Green Family Lecture. See you at the next one!

Date: Monday, October 25, 2021
Time: 4:30pm Pacific Standard Time
Venue: UCLA Ackerman Grand Ballroom (308 Westwood Plaza, 319 Kerckhoff Hall, Los Angeles, CA 90024)
This lecture is accessible to a general audience.

Learn about new developments in the study of supermassive black holes. Through the capture and analysis of twenty years of high-resolution imaging, the UCLA Galactic Center Group has moved the case for a supermassive black hole at the center of our galaxy from a possibility to a certainty and provided the best evidence to date for the existence of these truly exotic objects.  This was made possible with the first measurements of stellar orbits around a galactic nucleus. Further advances in state-of-the-art of high-resolution imaging technology on the world’s largest telescopes have greatly expanded the power of using stellar orbits to study black holes. Recent observations have revealed an environment around the black hole that is quite unexpected (young stars where there should be none; a lack of old stars where there should be many; and a puzzling new class of objects). Continued measurements of the motions of stars have solved many of the puzzles posed by these perplexing populations of stars. This work is providing insight into how black holes grow and the role that they play in regulating the growth of their host galaxies.  Measurements this past year of stellar orbits at the Galactic Center have provided new insight on how gravity works near a supermassive hole, a new and unexplored regime for this fundamental force of nature.

Speaker Bio:
Andrea M. Ghez, professor of Physics & Astronomy and Lauren B. Leichtman & Arthur E. Levine chair in Astrophysics, is one of the world’s leading experts in observational astrophysics and heads UCLA’s Galactic Center Group. Best known for her ground-breaking work on the center of our Galaxy, which has led to the best evidence to date for the existence of supermassive black holes, she has received numerous honors and awards. In 2020 she became the fourth woman to be awarded the Nobel Prize in Physics, sharing one half of the prize with Reinhard Genzel (the other half was awarded to Roger Penrose). She is the first woman to receive a Crafoord prize in any field, received the Bakerian Medal from the Royal Society of London, a MacArthur Fellowship, and was elected to the National Academy of Sciences, the American Academy of Arts & Sciences, and the American Philosophical Society.

Ghez earned her BS from MIT in 1987, and her PhD from Caltech in 1992 and has been on the faculty at UCLA since 1994.

Program Flyer

Accessibility: The Ackerman Grand Ballroom is fully accessible via 2 elevators that can be entered from the UCLA Store on the ground level.

Additional Covid-19 Safety: The safety of all IPAM participants is of great importance to us, and we will follow all guidelines established by UCLA, LA county, the state of California, and the CDC during this lecture event. We expect the talk to take place in-person as planned, but please check this web page for any updates. For Covid-19 safety measures on campus, visit:

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