Galaxy Ships
From Galaxy Attack: Alien Shooter Wiki
Galaxy Ships are a special category of ship, which send attacks to your opponent(s) in PvP. Galaxy Ships are a dull grey/blue colour.
When you first obtain a Galaxy ship, it will send an attack to your opponent. The icon of your ship will display a ring around it at the top of the screen. This ring ticks down, and when it gets to zero it will send another attack, and reset the countdown.