Where is everybody? Humans could theoretically colonize the galaxy in a million years or so, and if they could, astronauts from older civilizations could do the same. So why haven't They come to Earth?
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"We must always strive to use our knowledge for the betterment of humanity, and not for its destruction."
"The problem with statistics is that you can prove anything with them."
"Never underestimate the power of a good approximation."
"Physics is like sex: sure, it may give some practical results, but that's not why we do it."
"The future of science depends on the education of young people."
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The quote asks why, given the universe's vast age and size, we haven't detected extraterrestrial civilizations. If interstellar travel is physically achievable, a sufficiently advanced species could colonize every star system in the galaxy within a million years. Since the universe is billions of years old, older civilizations should have done this long ago. Yet Earth has no evidence of alien contact — a profound contradiction between probability and observation.
Fermi was legendary for rapid, precise estimations from first principles — now called 'Fermi estimates.' He built the first self-sustaining nuclear reactor (Chicago Pile-1, 1942) and worked at Los Alamos on the Manhattan Project. This offhand 1950 lunchtime remark with colleagues Teller and York exemplifies his character: transforming a casual conversation into a rigorous logical problem. His instinct to quantify the seemingly unquantifiable made him one of physics' greatest practical minds.
Fermi posed this question around 1950, amid the early Cold War, nuclear anxiety, and a wave of UFO sightings following Roswell in 1947. Humanity had just split the atom; the Soviet Union tested its first nuclear bomb in 1949. The Space Age hadn't begun yet, but scientists were grappling with whether advanced technology was self-defeating. The silence from space carried uncomfortable implications about whether civilizations survive their own destructive capabilities.
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