The question of whether or not we are alone in the universe has been pondered throughout human history. Ancient Greek philosophers such as Epicurus argued that there an infinite number of worlds in the universe that exist. An extensive line of philosophers, writers, and scientists have debated the topic over the centuries.
Back in 1994, astronomer and author Carl Sagan of Cornell University authored an article in Scientific American that called for the search for extraterrestrial life.
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