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A bright, glowing blue star with a burst of pink and purple energy emerging from its surface against a backdrop of dark space and faint clouds.

April 16, 2025

Extreme Plasma Processes Around Compact Objects

Jens Mahlmann, Dartmouth College

Colorful galaxy cluster in deep space with numerous stars, glowing clouds of purple and pink gas, and bright points of light scattered across a dark, star-filled background.

March 17, 2025

Particle Heating and Acceleration in Galaxy Clusters

Ellen Zweibel, University of Wisconsin-Madison

A woman with shoulder-length brown hair, wearing a black jacket, a black and white floral scarf, and a silver necklace, smiles in front of a light-colored brick wall.

November 17, 2017

Sackler Lecture: Einstein’s Waves: New Cosmic Sounds

One century following Einstein's prediction of spacetime disturbances and gravitational waves, the laser-enabled special detectors LIGO achieved the most accurate measurement ever made by humans across science and engineering and revealed to us the gravitational-wave signals produced by the most powerful collisions of black holes in the universe. These revolutionary discoveries have given birth to a brand new field of astronomy, a completely new way of sensing the cosmos and exploring its darkest corners. I will review the first direct detections of gravitational waves and what they can teach us about the nature of black holes and other exotic cosmic events.