Any time a large battle occurs leaving more than 100k debris behind, the owner of the planet where the battle took place receives a moonchance, and if lucky, a moon. Each 100k debris gives a 1% chance of producing a moon, up to a maximum of a 20% chance with 2M debris. There is no need to go beyond 1667 light fighters, as 20% is the highest moonchance percentage available: more will not increase the odds. The fleet needed to crush the kamikaze fleet is usually harder to attain due to its costs (including deuterium) and high end ships.