NASA has released a free, original tabletop role-playing game, and it’s one part educational experience and another part sci-fi/fantasy epic with magic and dragons.

The crux of The Lost Universe, the organization’s first TTRPG,involves a mystery: What would happen if the Hubble Space Telescope disappeared? It’s a simple premise and one that hides the complex backstory underscoring the events of the role-playing game. Without getting into the weeds, the game takes place on a planet called Exlaris, which was once thrown into chaos when a black hole moved too close and kicked it out of its orbit. The planet has since gone back to some degree of normalcy and is now almost completely dedicated to academia. In one city, a scholar named Eirik Hazn made a spell to connect with Earth to study the Hubble Space Telescope, which has famously collected data on black holes. However, the spell and telescope are stolen by a dragon, and researchers working on the project have been disappearing, so the players — Earthlings who worked on the telescope at NASA who were brought through a portal to Exlaris — have to save the day.