In Planetarium a new and unique solar system will be forged from the swirling mass of matter that orbits its star. Players will take part in this creation, moving tokens to simulate gravity and the accretion of matter, crashing it onto planets that have begun to form. Cards will be played that evolve each planet in significant and varied ways; from scorching one into a barren waste to transforming another into a potential nursery for life. Planets also migrate in their orbits, and each game ends with a completely unique system.