Setup: In player order, players take turns choosing an obstacle and placing it into the play area until all obstacles have been placed.
- Asteroids must be placed beyond range 2 of each other asteroid and beyond range 2 of each edge of the play area.
- Gas Clouds must be placed touching (but not overlapping) an asteroid and beyond range 0 of each other gas cloud.
Special Rule: After a ship at range 0 of or obstructed by a gas cloud defends, if the defender suffered at least 1 damage, each ship at rang 0-1 of the gas cloud suffers 1 damage. Then, remove the gas cloud.