įermi was not the first to ask the question. However, there is no convincing evidence that this has happened.Since many of the Sun-like stars are billions of years older than the Sun, the Earth should have already been visited by extraterrestrial civilizations, or at least their probes.Even at the slow pace of currently envisioned interstellar travel, the Milky Way galaxy could be completely traversed in a few million years.Some of these civilizations may have developed interstellar travel, a step humans are investigating now.If Earth-like planets are typical, some may have developed intelligent life long ago. Many of these stars, and hence their planets, are much older than the Sun.With high probability, some of these stars have Earth-like planets in a circumstellar habitable zone.There are billions of stars in the Milky Way similar to the Sun.The following are some of the facts and hypotheses that together serve to highlight the apparent contradiction: There have been many attempts to resolve the Fermi paradox, such as suggesting that intelligent extraterrestrial beings are extremely rare, that the lifetime of such civilizations is short, or that they exist but (for various reasons) humans see no evidence. The conversation moved on to other topics, until during lunch Fermi blurted out, "But where is everybody?" (although the exact quote is uncertain). While walking to lunch, the men discussed recent UFO reports and the possibility of faster-than-light travel. Italian-American physicist Enrico Fermi's name is associated with the paradox because of a casual conversation in the summer of 1950 with fellow physicists Edward Teller, Herbert York, and Emil Konopinski. As a 2015 article put it, "If life is so easy, someone from somewhere must have come calling by now." The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life compared to the apparently high a priori likelihood of its existence. A graphical representation of the Arecibo message, humanity's first attempt to use radio waves to actively communicate its existence to alien civilizations
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