game play purposes, the placement of the Earth's Moon and the Jovian moons were not to scale. Gameplay The clear acetate overlay allowed each player to plot the movement vectors of their ships. Each ship could accelerate during the turn, which then modified the vector one hex in any direction. The ships continued to follow their current vector from turn to turn, which could only be modified by acceleration or by entering the "gravity field" of a planet. For simplification purposes, this gravity field consisted of the six hexes surrounding the planet. Moons had a weaker gravity that only affected a course when ships pass through two adjacent hexes Acceleration consumed part of a ship's fuel supply, and players were required to track the current fuel remaining on each ship. If all the fuel was consumed, a ship would be unable to accelerate. Ships could refuel by landing on friendly planets, orbiting a base, or passing slowly through an asteroid base. They could also refuel by matching speed with another ship (such as a tanker) and transferring fuel. Each game was played in a series of turns that alternated between each of the players. Each turn a player followed a sequence of five phases: Astrogation — plot the movement vector of each ship. Ordnance — launch mines and torpedoes from ships. Movement — follow plotted course to new location. Combat — attack enemy ships in range, including using mines and torpedoes; roll for space hazards. Resupply — perform various logistical activities, as well as looting and rescue. Ship counters displayed the vessel silhouette, an identifier number, the combat rating, fuel capacity, and the cargo capacity. The counters were printed in several colors to represent different sides in each conflict. Combat used a damage table that was based on the ratio of the attacker ship combat strength to that of the defender. The odds ranged from 1:2 to 4:1. A six-sided dice roll was used to determine the results of an attack, with one subtracted from the roll for each hex of range between the ships. Before the results are applied, the ship being attacked can optionally fire upon its attackers. The results of an attack are expressed in a number of turns the ship is disabled, or, for high odds and a favorable roll, the ship is destroyed. Higher dice rolls resulted in more damage. If the cumulative damage to