Ancient astronauts have been a topic of fascination for many for decades. They are believed to be extraterrestrial beings who visited Earth in prehistoric times and influenced human development. While the term "ancient astronauts" is commonly used, there are other synonyms available, including "paleocontact," "paleo-seti," and "panspermia" to describe this theory. "Paleocontact" refers to the idea of contact with extraterrestrial beings in ancient times. "Paleo-seti" is short for "paleo-search for extraterrestrial intelligence," and finally, "panspermia" proposes that life on Earth was seeded from outer space. These synonyms expand upon the concept of ancient astronauts and provide additional avenues for exploration and research.