I'm having some trouble introducing lore naturally in dialogue. Context : A newly discovered exoplanet is being terraformed. During the terraforming process, some scientists discover remnants of an ancient civilization. Initially, they assume "Aliens!", but it is later revealed that the planet was previously inhabited by the human deities of ancient mythology (Zeus, Osiris, Vishnu, Santa Claus, etc.). All the religions of the old world are technological conspiracies, accounts of advanced technologies as seen through the eyes of a caveman. The exoplanet is the "heaven" that is referenced throughout the various religious texts. This specific detail is important for keeping with the theme of humanity's technological ascension into godhood and explaining why the planet is more capable of being terraformed than the others (Mars has small settlements, but cannot easily be turned into a second earth). How do I reveal through dialogue that the exoplanet is previously inhabited by a more advanced group of humans without it sounding like raw exposition?