Donald York, University of Chicago astronomer who co-founded the Sloan Digital Sky Survey, dies at 81
- Posted on February 7, 2026
- By Chicago Tribune
- 2 Views
Donald York, University of Chicago astronomer who co-founded the Sloan Digital Sky Survey, dies at 81
York was the first researcher to find an isotope of hydrogen known as deuterium, which helped give researchers an understanding of dark matter.
