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Six-panel sequence showing colorized simulations of star formation. Over time, swirling blue and yellow gas shapes evolve from a single star to the formation of a binary and then a five-star system. Distances are labeled in AU.

March 18, 2025

The First Stars: Formation, Properties, and Impact

Ralf Klessen, Heidelberg University

A distant galaxy glows with pink, blue, and white light, surrounded by countless small stars against a dark, star-filled background in deep space.

March 17, 2025

The Co-Evolution of Wind Blown Bubbles and Photo-Ionized Gas

Lachlan Lancaster, Columbia University

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.