Our docent will give a guided tour of September night skies, followed by “The Dark Matter Mystery,” a fulldome production. What keeps galaxies together? What are the building blocks of the Universe? What makes the universe look the way it looks today? Researchers all around the world try to answer these questions. We know today that approximately a quarter of the universe is filled with a mysterious glue: dark matter. We know that it is out there. But we have no idea what it is made out of.