This is a conference covering the ancient astronaut theory, planet x (also known as Niburu) and shows proof aliens exist. The truth about ancient alien astronauts and PlanetX. Ancient astronauts or ancient aliens is also known as the paleocontact hypothesis. Ancient astronauts appear as a feature of UFO religions from the beginning. The gods of old Mesopotamia were actually astronauts from the planet "Nibiru", or planet X. It is also theorized that ancient astronauts are responsible for the moon and mars structures.