From ancient star-reading routes in Brazil to the observatories of Chile's Atacama Desert, this film traces how the night sky has shaped both human culture and animal biology. Indigenous communities describe navigation and calendar systems built on constellations, while astronomers at some of the world's most advanced telescopes explain what those same instruments now reveal about the cosmos. Astrophotographers set up long-exposure rigs to capture the Milky Way arching over dark landscapes, their footage forming much of the film's visual core. Alongside the human story runs a biological one: sea turtle hatchlings that rely on the natural light of the horizon to find the ocean, and the conservationists working beaches at night to keep artificial lighting from luring them the wrong way. The film links these threads through light pollution, showing how the glow of cities is erasing a resource that both cultures and species depend on. It moves between telescope domes, coastal nesting sites, and interviews with scientists and local guides, building a case for why dark skies matter beyond stargazing.