Matter swirls around a new born star, coalescing on the planetoids that orbit it. Planets evolve, grow and migrate in their orbits, forming a unique solar system by the end of every game. Planetarium is a game of creation, chaos and terraforming on the grandest scale. Players are competing to crash combinations of elements onto planets that then allow them to play cards to evolve the planets in a variety of ways, with each player looking to evolve planets in the system to suit their own secret endgame goals. On a turn a player will firstly move a matter or planet token in a clockwise direction around the star. The board is mapped with a series of lines, tracing orbits around the star, and it is along these lines that the tokens are moved. If a matter token moves onto a space occupied by planet token then the matter token is placed on the player's mat (on the respective planet). In the same way, planets can also be moved onto matter tokens, placing the matter tokens on the player's mat.