William (Jack) Welch, a pioneering astronomer whose visionary work in radio astronomy helped advance the search for extraterrestrial technology, passed away this week at 90. Welch, a professor at the University of California, Berkeley, played a pivotal role in designing and developing the SETI Institute’s Allen Telescope Array, significantly advancing our understanding of the universe. Welch was married to SETI Institute co-founder Jill Tarter. https://www.seti.org/astronomer-william-jack-welch-dies
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