Ancient aliens, also known as ancient astronauts or paleocontact, is a pseudoscientific hypothesis that proposes that extraterrestrial beings visited Earth in prehistoric or historic times and made contact with humans. The term is often used to describe theories that suggest aliens influenced ancient human civilizations, technologies, and cultures. In Hebrew, this concept can be translated as חוצנים קדומים (khutsaním kadumím). The idea gained popularity through the works of authors like Erich von Däniken, who argued in his 1968 book Chariots of the Gods? that ancient astronauts were responsible for many of the world's technological and cultural advancements. Proponents of the ancient aliens hypothesis often point to ancient artifacts, structures, and artwork as evidence of extraterrestrial influence. However, mainstream archaeologists, historians, and scientists widely reject these claims, attributing such phenomena to human ingenuity and natural processes. The concept has been explored in various forms of media, including television shows like Ancient Aliens and films such as Stargate and 2001: A Space Odyssey.