This is such an easy question that it was answered fucking 2500 years ago. Parmenides, born 515 BC, said "we can speak and think of only what exists, ex nihilo nihil fit." Uneducated fucking mouthbreather retards who have an affinity with the "wisdom" of modern-day slave-science, Carl Sagan retardation, and Rick and Morty trivia, who have never opened (and read, though I'm sure they wouldv'e forgotten that step if they undertook the daunting task) a book of worth up in their lives, who have no knowledge of history (other than internet trivia), who are artistically retarded, who are heavy on their feet, clunky, ugly, stupid, would still ask such a question.