There are also 14 moon territories. These also start out empty. They are divided into three zones that give bonuses like continents. You can attack the moon from any space station you control to any landing site on the moon. The moon is easy to take but hard to hold.
Energy works like money in the game.
At the start of your turn you get energy equal to the number of armies you get. Energy is used to hire commanders, build space stations, buy command cards, play command cards, bid for turn order, and as the tie-breaker at the end of the game. Managing your energy is vital. You need to have a Commander on the board to buy and play command cards of that type. Commanders also allow your armies to move into the sea or the moon.