Text from the American Astronomical Society (AAS) Press Release:

The 2026 Chambliss Astronomical Writing Award for astronomy writing for an academic audience, specifically textbooks at either the upper-division undergraduate or graduate level, is awarded to Marc Pinsonneault and Barbara Ryden (The Ohio State University) for the textbook Stellar Structure and Evolution (2023 Cambridge University Press). Pinsonneault and Ryden successfully incorporate innovative pedagogical features into this graduate-level text, emphasizing intuitive understanding through both qualitative and quantitative reasoning, with a clear and easy to follow progression of learning.

The Lancelot M. Berkeley–New York Community Trust Prize is awarded for highly meritorious work in advancing the science of astronomy, and this year’s prize goes to the Dark Energy Spectroscopic Instrument (DESI) collaboration, an international experiment to constrain possible models of dark energy. The annual Berkeley prize winner is chosen by the three AAS Vice Presidents, in consultation with the Editor in Chief of the AAS journals, to honor significant research published within the preceding 12 months. The DESI collaboration is honored for work creating the largest 3D map of the universe, which enables the study of the effects of dark energy over cosmic time, and particularly for precise measurements of baryon acoustic oscillations as a function of redshift all the way to z = 2.3, when the universe was less than three billion years old.