A moon-destruction mission lets you attempt to remove an existing moon with Death Stars. Success is not guaranteed: the game rolls moon destruction and destruction of the attacking fleet separately.
How is moon-destruction chance calculated?
The mechanic uses moon diameter and the number of Death Stars, with integer square roots:
moon chance [%] = min(100, (100 − floor(√diameter)) × floor(√RIPs)).
More RIPs increase the chance in steps because floor(√RIPs) is used. One to three Death Stars give multiplier 1, four to eight multiplier 2 and nine to fifteen multiplier 3.
How is fleet-loss chance calculated?
The risk to the attacking fleet depends on moon size but not on the number of RIPs:
fleet loss chance [%] = min(100, floor(√diameter) × 0.5).
For diameter 8000, floor(√8000)=89, giving about 44.5% fleet-loss risk. With 10 RIPs, floor(√10)=3, so the moon-destruction chance is (100−89)×3 = 33%.
Are the two rolls independent?
Yes. This creates four possible outcomes: both moon and fleet survive; moon is destroyed and fleet returns; moon survives but fleet is destroyed; or both are destroyed.
What is required?
The target must have a moon and the mission must contain at least one Death Star. Without a moon or without a RIP, no destruction roll is made and the fleet starts its return.
Examples
| Diameter | RIPs | Moon chance | Fleet risk |
|---|---|---|---|
| 6000 | 1 | 23% | 38.5% |
| 6000 | 9 | 69% | 38.5% |
| 8000 | 10 | 33% | 44.5% |
| 9000 | 16 | 24% | 47% |
What exactly disappears after a successful destruction?
If the target is stored as a separate moon entity, a successful roll removes that moon from the game. The code also clears the moon’s building queue and its local Bank account/log records. If the destroyed moon was selected as the account’s active or mother location, the game resolves a safe fallback location.
The fleet-destruction roll remains independent. A moon can be destroyed while the Death Stars survive and return, or the fleet may be lost regardless of the moon result. If a valid moon no longer exists when the mission arrives, no destruction roll is performed and the mission starts its return instead.
This makes the mission more than a simple percentage check: the attacker should evaluate both the cost of the Death Stars and the infrastructure that may disappear with the target moon.
FAQ — moon destruction
Do more Death Stars reduce fleet-loss risk?
No. RIP count raises moon-destruction chance, while fleet-loss risk depends only on moon diameter.
Does destroying the moon always destroy the fleet?
No. They are separate random rolls.
Related FAQ: How is a moon created? · How does the Sensor Phalanx work? · How does the Jump Gate work?