Shep Doeleman on Photographing Black Holes

CELESTIAL SPHERES

Date: March 12, 2026 Time: 06:00PM EDT

Location: Barker Center, Thompson Room

Speaker: Shep Doeleman, Harvard University / Smithsonian Astrophysical Observatory

Can you take a photograph of a black hole? What does it mean to have imaged an object whose nature is to remain unseen? Black holes are cosmic objects so small and dense that nothing, not even light, can escape their gravitational pull.  Until recently, no one had ever seen what a black hole actually looked like.  Einstein’s theories predict that a distant observer should see a ring of light encircling the black hole, which forms when radiation emitted by infalling hot gas is lensed by the extreme gravity near the event horizon.  The Event Horizon Telescope (EHT) is a global array of radio dishes, linked together by a network of atomic clocks to form an Earth-sized virtual telescope that can resolve the nearest supermassive black holes where this ring feature may be measured. The EHT has now successfully imaged the 6.5 billion solar mass black hole at the center of galaxy M87, and the 4 million solar mass black hole at the center of the Milky Way – both objects exhibiting the predicted strong gravitational lensing that confirms the theory of General Relativity at the boundary of a black hole.  This talk will cover how this was accomplished, details of the first results, and future directions. Following the talk, Doeleman will be in conversation with seminar leader Jennifer L. Roberts about how astrophysicists and humanities scholars share approaches to the unknown and unknowable.

About the speaker

Sheperd S. Doeleman is an Astrophysicist at the Center for Astrophysics | Harvard & Smithsonian and Founding Director of the Event Horizon Telescope (EHT), a synchronized global array of radio observatories designed to examine the nature of black holes. He is also a Harvard Senior Research Fellow and a Project Co-Leader of Harvard’s recently established Black Hole Initiative (BHI). The BHI is a first-of-its-kind interdisciplinary program at the University that brings together the disciplines of Astronomy, Physics, Mathematics, Philosophy, and History of Science to define and establish black hole science as a new field of study.

Jennifer L. Roberts

Association of Print Scholars 10th Annual DIstinguished Scholar Lecture
X.D. and Nancy Yang Professor of Arts and Sciences
Drew Gilpin Faust Professor of the Humanities

Harvard University
November 14th, 2025