Between the mid-1970s and early 1980s, two physicists, Michael Hart and Frank Tipler, published a controversial series of papers arguing that extraterrestrial intelligence didn't exist. As they argued, the likelihood that extraterrestrial civilizations (ETCs) would have had enough time to develo...
Source: [Phys.org](https://phys.org/news/2026-06-david-kipping-advanced-life-universe.html)